Dr. Tommy Wood — How to Future-Proof Your Brain from Dementia (#851) - The Blog of Author Tim Ferriss

Hello, boys and girls, ladies and germs. This is Tim Ferris. Welcome to another episode of the Tim Ferris show, where it's my job to interview world class performers to tease out how they do what they do or to tease out the frameworks, the specifics, the practical, tactical that you can apply to your own lives. This episode I've been trying to set up for a while. My guest is doctor Tommy Wood. He is an associate professor of pediatrics and neuroscience at the University of Washington, where his research focuses on brain health across the lifespan. This includes therapies for brain injury in newborns, prevention and treatment of adult brain trauma, and the factors that contribute to long term cognitive function and cognitive decline. It turns out there's a lot that you can actually do. It is not an inexorable decline into not recognizing your family. There's actually quite a bit from the perspective of lifestyle, supplementation, and much more that you can do to try to stack the odds in your favor, cognitively speaking. Tommy received an undergraduate degree in biochemistry from the University of Cambridge, a medical degree from the University of Oxford, and a PhD in physiology and neuroscience from the University of Oslo. Alongside his academic work, Tommy is head scientist for motorsport at HINSA Performance, overseeing health and performance programs for multiple formula one drivers. He works with a lot of professional athletes. He has also trained and competed in multiple sports himself, coming in the top 20 in the world for the world's first ever fully off road Ironman Triathlon and second at Washington's Strongest Man in 2024. Tommy is one of a kind. He's also cohost of the Better Brain Fitness podcast and author of the forthcoming book, The Stimulated Mind, which I encourage people to check out. His website is doctortommywood.com with a d r d r, Tommy Wood, doctortommywood.com. You can find him on Instagram at doctor Tommy Wood, also d r at doctor Tommy Wood. And without further ado, please enjoy a very wide ranging, very, very concrete conversation with doctor Tommy Wood. Optimal minimal. At this altitude, I can run flat out for a half mile before my hands start to shake. Can I ask you a personal question? Now I would assume that I put big time. What it's like to be dying? I'm a cybernetic organism living this year with metal endoskeleton. Me, Tim, Paris, Tommy, Tommy, Tommy, nice to see you. Nice to see you. Thanks for making the time. Yeah. Thanks for having me. Absolutely. And as mentioned before we started recording, this is just gonna be like our last conversation because I wanted to reach out to you because cognition, cognition, cognition. Boy, oh, boy is that on the mind and pun intended on one level, but we are gonna bounce all over the place. And I hope to give people, including myself, a lot of tactical, practical recommendations. Also being clear where the science is solid and where the science is maybe a little thinner ice, right? Or where something is plausible, but not yet proven out. And you've got me chewing xylitol gum. You got me looking at air purifiers, but I'm skipping ahead. Let's go back to the beginning, and I wanna give the good old doctor Chatterjee a nod here because it came up in a conversation you had with him. And I was like, wow. I never would have thought of that. Why are human babies so plump? Why are they so fat compared to other species? If you look at human babies compared to pretty much every other mammalian species, we are the only species that's born fat even compared to other primates. And it's thought that the primary reason for this is that that fat is a repository for things that the brain needs in order to develop. And the two that are probably most interesting to you and seems to be particularly important are DHA, the omega three fatty acid, and fats as a source of ketones for the brain. When the brain is developing in particular, and I think this is also very relevant to recovery from brain injuries and other states, the preferred synthetic precursor as in the thing that the brain uses to make structure like fats and cholesterol and that kind of stuff, which makes up a significant chunk of the brain. Ketones are the preferred source, particularly in the developing brain, but I think also in the later on in, you know, various states as an adult. And so in order to support that very hungry brain, which it is particularly in in humans, we're born fat so that we can generate a bunch of ketones to support that brain developing for the first especially for the first few weeks, but maybe even for months after that. Also, I have lots of, as I understand it, beautiful bat brown adipose tissue to keep those little harmless monkeys warm. Yeah. Alright. So we're going to talk about, because I think the, in a sense, the extremes inform the mean, but not the other way around. So we can talk about certain maybe edge cases, things that people might not view as immediately relevant to themselves. But since we're talking about newborns, I'm curious, you've looked at therapies, various types of research into brain injury in newborns. What do you do? What can you do? I mean, what's the state of the art when it comes to treating brain injury in newborns or in infants? There's two main brain injuries of babies that I study, and they're probably also the two main brain injuries that are most broadly studied just because of their impact. And so the first is preterm brain injury. So that's a baby is born early. The earlier you're born, the greater the risk of neurodevelopment of impairment or, you know, some other kind of neurological disorder, cerebral palsy, other impairments later in life. And the other is something that we call hypoxic ischemic encephalopathy, which is essentially you get to normal full term, something happens. Not enough oxygen. Exactly. Not enough blood flow, not enough oxygen get to the brain. Something happens usually during childbirth, and people think about, you know, the cord is wrapped around the neck or you can get placental abruption. Right? The placenta kinda tears off the inside of the uterus or, like, the uterus can completely rupture. But sometimes we don't know what happened. The baby just comes out and, like, something has happened. In that scenario, the second one, HIE, as we call it, those babies are cooled down. So this is something that I studied a lot in my PhD. You take that baby, and as long as you start within a few hours of birth, you cool them down to 33.5 degrees Celsius for seventy two hours. And that significantly reduces death and disability. That's 92.3 degrees Fahrenheit for you Yankees out there. Although, even in The US, many of the cooling machines are made in Europe, so they still run on Celsius. So those babies get cooled down, and that's really the state of the art. Although now we're starting to figure out that there are still a whole bunch of injuries where that doesn't help, including preterm babies. So if you're born preterm, cooling doesn't help. Actually, it can be detrimental. And in that scenario, one of the things that they found recently, which is probably most beneficial, is caffeine. So Really? Yeah. Caffeine is not given for neuroprotection. It's given because babies who are born preterm don't breathe as well. They have this thing called apnea prematurity, so they don't have, like, a normal respiratory drive. So you give caffeine to stimulate that. But the trials that used caffeine to treat apnea prematurity saw significant improvements in cognitive function. And those were durable improvements or just during treatment with caffeine? When you do these kinds of trials, usually, you follow those babies up to something like two or three years old. That's mainly because an NIH funded trial or NIH grant lasts five years. So if you're gonna do a full trial in five years, then you have a year or two to enroll and treat, and then you you have two or three years to follow them up. And so they see significant improvement at that age, but then also, you know, going into childhood, which is ideal. You really wanna look out as far as you can. So then there's now a renewed interest in caffeine and other brain injuries in babies, and that's something that we've tested in my lab. There are some trials now starting in other brain injuries. But beyond that, in both groups, really the biggest impact on later outcomes is the home environment that kid goes back to. So, yes, my colleagues who are practicing the neonatologist do a whole bunch of amazing stuff to keep these babies alive and keep their brains in good shape as much as they can when they're in the intensive care unit. But, actually, the home environment is where the biggest impact happens. And so then that means that even if you have an imperfect start to life, there's probably a lot that you can do as a parent to help that brain to develop and grow, you know, as normally as possible. Alright. We're gonna continue to talk about brain injury for a little bit, and then we're gonna talk about a whole lot of sort of multifactorial prisms around cognition and whether or not you can intervene with the fates to preserve or enhance cognition as an adult. Right? So we're going to get to that. But if we make the hop from infant to adult, right, if you slipped on the ice and hit the back of your head and suffered a severe concussion, what would you personally do after that? There are a few things that I think we can probably do, and we actually, wrote a paper about this. It came out last year that covered various nutritional strategies, and most of the strategies will be nutritional supplements that I would I would probably lean on. And assuming that I didn't have any control over what happened beforehand, ideally, I do lots of things to improve the health of myself. Right? Because I think that's gonna affect how my brain and body then respond to the injury. But after that point, then there's a couple of things that I would do. One is I would manage fevers. So this goes back to the hypothermia that we talked about in babies. Lots of trials have tried hypothermia for traumatic brain injury in older humans and adults, and they haven't really shown any benefit. What does seem to be beneficial is preventing hyperthermia. So if you have significant trauma, one of the things that happens is the immune system gets activated. You get is you get a fever. And that fever increases this gap between the metabolic demand in the brain and the supply of energy because the mitochondria become damaged during the injury. So if you increase that gap because the higher metabolic rate because you're hotter, that seems to make that injury worse. And this has been found in some animal models, but also in some human data. So the most important thing to do is to prevent fevers. So get your flu shots, etcetera. Other things? So in this scenario, you know, if you need to take Tylenol to prevent a fever I see. Take acetaminophen. Right. Yeah. Acetaminophen, paracetamol, depending on where you are in the world. Yeah. Where you are. You know, maybe even there are some devices where you can do some neck cooling or head cooling. They probably don't have as much of an effect as some people think they do, but whatever you can do to maintain your body temperature. And so antipyretics, so things that help prevent fevers that they're gonna be helpful. I would then also manage blood sugar. The main thing being probably avoiding things that are gonna cause large glucose spikes. So avoiding refined carbohydrates. Why does that matter acutely after you whack your head? So you see, again, in in multiple studies so and we have to do this experimentally. So some of this comes from animal models. But if you create diabetes or the hypoglycemic during the injury or immediately afterwards, and some of it is driven by the injury, if you have, like, an acute injury, you're gonna get higher blood sugar. So some is cause, some is effect. But it seems that these high glucose spikes are, again, stressful in that setting of an acute brain injury. So just minimizing that as much as possible, that doesn't mean that you shouldn't eat carbohydrates, but just like I would avoid refined carbohydrates when I sort of worked with athletes at high risk of concussions. Like, if you're being taken off the field, a low risk thing is just to not chug Powerade as you're being, like, taken down the tunnel. Other things that are gonna become important with varying degrees of evidence, but still good enough that there's a high sort of positive asymmetry. Right? High possibility of benefit with low risk creatine supplementation. Creatine is probably more beneficial if you have it on board beforehand, but there's at least one trial in pediatric TBI that showed, creatine enhanced recovery. Omega three fatty acids, the same. We would certainly include those as well. And then the next thing is I would do is I would take the zooxidase ketones. I have them at home. There are things I've played with. I don't use them regularly, but in this setting, again, I think there's enough promise to suggest that they're worth taking. I didn't include that in this paper because we don't have good evidence for it. But if I had a brain injury, I would take it all over these ketones. I would too. Yeah. I would too. And then there were a few other things that have an increasing amount of evidence for them. So there's some studies on some B vitamins, particularly riboflavin. Branch chain amino acids seem to be beneficial, and that seems to be by improving sleep. Then if you have sleep issues, melatonin has some evidence for it as well. I would avoid caffeine actually in this scenario. There's a little bit of evidence that says that, again, it was probably due to increasing brain metabolic rate in that sort of early window similar to high temperature, so I would avoid caffeine particularly early on. And then probably the most important thing that we have evidence for is early return to physical activity. So low level aerobic exercise as soon as you can tolerate it at a level that doesn't make symptoms worse and then increasing that over time as you get better, that's gonna be an important part of recovery as well. What's the supposed mechanism of action with the return to physical exercise and the impact that has on the recovery from, say, concussion? There's probably a few different mechanisms. And to be honest, I I don't think anybody really knows. Again, the the evidence is best in pediatric brain injury, particularly, pediatric sports related concussions. That's what they've done most of these, like, randomized controlled trials. But there's a few things that are gonna be happening. You're gonna be improving cerebral blood flow, probably gonna get a whole bunch of myokines, exokines that get released during physical activity. We know many of those can have a beneficial effect on the brain. And then you may also see improvements in sleep. Right? We know that physical activity helps support sleep. So many of those could be going on at the same time as long as you're not doing a level of activity that's then making symptoms worse. Just a quick thanks to our sponsors, and we'll be right back to the show. What many of you may not know is that I actually run two private invite only communities for some of my projects. The Notebook, which eventually will come out after god knows how long, and Coyote, the card game. And the feedback from those groups has been absolutely invaluable. Moreover, perhaps most important, the connections that members have made and the interactions have been just a joy to behold. It's been so much fun. And I generally view communities as headache after headache after headache, way back in the day with, like, vBulletin and whatever, not to slam those guys. But man oh man, running communities can be a pain in the ass. And in this case, it's been easy. Why? Well, both of them are built on Circle, this episode sponsor. And before committing to using Circle, I did so much homework. I asked you all on social media, talked to dozens of creators, pressure tested alternatives, talked to all sorts of people on the phone. And Circle is where I landed. Circle quietly backs some of the most popular communities online run by folks like Kevin Rose, my buddy, doctor Becky from Good Inside, Ali Abdaal, Jay Shetty, Pat Flynn, and many others, including some giants I can't mention here. But it doesn't need to be giant. My two communities are maybe a hundred, hundred and fifty people a piece. They're not gigantic. If you run an online community, a membership, or a course business, Circle makes it easy to build a professional home for your audience. Events, courses, payments, custom branded apps, all in one place. And, also, once I had my first one set up for the notebook to spin up another one for Coyote, the card game, it took minutes. It was so, so fast. And as you might have noticed, things are getting pretty squirrely out there on the Internet. We're moving from content businesses to connection businesses. People want connection. They wanna know you're real. They want accountability, real progress, and communities are the most effective way that I have found to make that happen. So check it out. Go to circle.so/tim to get $1,000 off Circle Plus, exclusively for you guys listeners for a limited time. Check it out. You can also look at other options at circle.so/tim. Folks, tax season is upon us. Fun. Fun. Fun. It always has a way of forcing us to look at our finances whether we want to or not. And if you're dreading that moment, it's a lot to pull together. There are ways to make your finances easier and far less stressful. Today's sponsor, Monarch, is the all in one personal finance tool. It's used by a bunch of my friends. It's used by my employees. It's designed to help make your life easier. It brings your entire financial life together in one dashboard on your phone or laptop. One person on my team has tried four other budgeting apps, said linking everything together on Monarch was by far the easiest. Another said, to be honest, I'm quoting directly here. To be honest, the widgets are the most helpful thing for me because I can see shopping, food, and big expenses all on my screen without having to open the app. And then she gives the reason. I often forget about when things like car payments are happening, and now I know not to go overboard at Target or something like that. Right? So it makes it visible, easy to grasp. And in their 2025 survey, eight out of 10 members said Monarch helps them feel more in control over their finances. Monarch has helped users save more than 200 per month on average. You can also share your Monarch account with a partner or financial advisor at no extra charge, and seven out of 10 members say it's improved financial conversations in their relationship. This is true for my employees as well as couples being on the same page. So set yourself up for financial success in 2026 with Monarch. Check it out. Use code Tim at monarch.com for half off of your first year. That's 50% off your first year at monarch.com with code Tim. All right. So we're going to take a moment, not for a commercial break, but just for a topical break to ask a very important question, which is when you came in second, at Washington's Strongest Man in 2024, and then when you came in the top 20 in the world's first ever fully off road Ironman triathlon, what were your weights? What was your body weight in both of those cases? Those two competitions were more than a decade apart, I will say. So in 2012, I was only the world's first fully off road Ironman. It was initially called X Man, and then, Marvel sued the company. So it ended up being called X Tri twenty four. So when I did that, I think I was probably something like low eighty q, eighty two, eighty three kilos. So, like, you know, hundred and eighty five pounds, something like that. And then fast forward a decade when I was competing in Washington, the strongest man, I was in the middleweight class. And to get into that class, I had to basically diet down and then do a water cut to get under one hundred and ninety eight pounds. So I was just under ninety kilos on the day. Although, not you know, normally, I'd I'd hang out, like, 15 pounds higher than that. It's okay. Super interesting. We may come back to that. We're certainly gonna talk about your own personal routines and tricks of the trade that you apply. Before we do that, I want to tie up a couple of loose ends, specifically infant, baby, this thing you mentioned, DHA, and why that and or omega threes, more broadly speaking, are important. And I, for instance, I'd say one meal a day is probably right now two cans of sardines or chub mackerel mixed with some type of oil, like olive oil or MCT oil with a splash of apple cider vinegar. It's shockingly good. It sounds like cat food. It's actually better than it sounds with some salt. But could you explain why this DHA, etcetera, is important? You also mentioned the omega three in the context of recovery from brain injury. So why is it important and what is the prescription, so to speak? Like, how can people translate that into something they actually do? When you think about, again, sort of the structure of the brain and you try and develop the brain in the first place. Big pile of fat. Big pile of fat. And a lot of that fat is DHA. And, actually, brain, if you don't mind eating brain, brain is a great source of omega threes. I tried it. I tried sheep brain in Turkey. I'm gonna tell you, the presentation could've used some work. It was just like straight out of the formaldehyde jar plopped onto a plate. It was a bit much for me, to be honest. But yeah. You can fancy it up if you want. But equally, brain consumption is is not required. So DHA tends to concentrate at the synapses of neurons. It seems to be really important for, like, helping to regulate the release of neurotransmitters, like being part of the structural component of those synapses. It also tends to accumulate in mitochondria, and the DHA content of mitochondria is, like, positively correlated with their capacity for energy production. Some of it could be due to, like, some some weird, like, physical, as in physics properties of DHA, like how electrons move through it differently from other fats. But, anyway, it seems that particularly for mitochondrial function as well as synaptic function, DHA is critical, and so it sort of preferentially accumulates in those areas. Very important during brain development so much so that the mother will sacrifice her own DHA stores so that the baby gets enough if she's sort of borderline in terms of DHA levels. And it's also why women in general tend to be better at converting shorter chain omega three fatty acids like ALA to DHA and EPA. It's thought that that's because that's gonna be needed for a baby one day more so than in men. So eat brains or find someone you can breastfeed on. Am I hearing this correctly? Yeah. I'm just kidding. Are those the only two options? I'm not sure. I'm kidding. Oh, wait. I forgot about the fish. I forgot about the fish. Oh, you could eat some fish. Optional third. Then we also know that DHA in particular, but also, EPA, these are the both the long chain omega three fatty acids. They're important precursors for various signaling molecules that are important as it pertains to brain function, but also recovery from brain injury. What is an example of a signaling molecule? A lot of the various molecules that have various functions in our body, activating receptors, turning genes on and off, are derived from different fats. And so in this setting, the ones I'm thinking about are called, like, resolvins, myresins, protectins that are derived from these unsaturated fatty acids. And so neuroprotectin d one is one that people are very interested in. It's being tested as you know, you give it exogenously after different brain injuries. We're not at a point where I would recommend that people take it, but that's something that that's being studied right now. And neuroprotectin d one is derived from DHA. In the setting of brain injury, these resolvins and protectins seem to be really important for regulating the immune response, in particular switching off the immune response. Right? The immune response is important, but we also need to be able to switch it off. And that's probably part of the role that they're playing. When you look at long term omega three supplementation, there was a study that was done in football players where they randomized them to different levels of DHA across the season, And they found that those taking one to two grams of DHA a day saw less of an accumulation of a marker of brain injury in the blood called neurofilament light across the season. The thought being that, you know, all these small sort of subconcussive impacts that the kids experience on the field is generating this sort of low level of injury that accumulates across the season, and omega threes or DHA seem to protect against that. So all of those to say that if you want to maintain brain function, and we and we see if you're omega three deficient, you're at higher risk of dementia, cognitive decline. That's dependent on other things like methylation status, but it's gonna be an important component of maintaining, brain structure and function. So I think that kind of level, you know, one to two grams a day on average, at least, you know, if you get two or three good servings of seafood a week or a a reasonable supplement, that's gonna be probably enough to consistently hit those levels. The other part of it is that your body will actively sequester extra up to a point. So when people are talking about different forms of DHA, right, should you take your omega threes as a phospholipid form or a triglyceride form, and the triglyceride form is more common in seafood. The studies that look at these over long periods of time, what happens is if you consume a lot of the triglyceride form from seafood, your adipose tissue is used as a storage place. So it cycles through the adipose, and then it gets released and the brain can use it afterwards. So that probably requires you to spend periods of time. We are accessing your adipose tissue. Right? You're not constantly eating. So exercise or periods of fasting may help you access that depot. But that depot, you know, allows us to then use these other forms of of DHA that can sort of accumulate in our bodies over time, and then we use them as we need them. I'm wondering if there's anything else, and it may end up circling back around as well. But is there anything else related to omega three specifically that you'd like to comment on? And am I, I could be hallucinating here. It's not just AI that does it, but omega three, does that have oh, no. It was b complex, which you'd brought up before, perhaps. Or maybe there is an interaction with omega three and homocysteine. Yes. I'm trying to figure out where homocysteine fits into the picture with respect to cognitive health. There absolutely seems to be this interaction between omega three status and b vitamin status, particularly the b vitamins that were involved in methylation, so they affect the level of something called homocysteine. And this is something you can get, a blood test for. And those who have inadequate B vitamin status or inadequate methylation status have an elevation of homocysteine. There have been multiple trials that that happened sort of two or three decades ago. Yeah. Maybe even in the last decade where people thought, oh, omega threes are gonna be the answer to dementia prevention or b vitamins and home assistant are gonna be the answer to dementia prevention. And then they would give people b vitamins or omega threes, and then they didn't see much of an effect. What we found out later, you know, the scientific we, was that both are required in order to see benefit. So this is probably first seen in the Vitacog trial, which is run by David Smith at Oxford. And they found in individuals with elevated homocysteine, so that was a level above 13, giving b vitamins to reduce homocysteine significantly improves rate of brain atrophy and cognitive function only in those who had an adequate omega three status. And the same thing was seen in the b proof trial subsequently, and then the opposite, which was seen in the omega a d trial where they gave omega three fatty acids, but they found they only saw benefit in individuals who had a low enough homocysteine. It's thought to be because if you want DHA to be in a membrane, in a cell in your brain, it needs to be attached to some kind of phospholipid. Right? Fats don't just, like, flow around. They're part of these phospholipids that sit inside the cell membrane, and that requires it to be attached to a head group. These head groups are usually derived from choline or an ethanolamine, although those can be converted from one to the other. And in order to do all of that kind of biochemical attaching and placement requires methylation that is very methylation dependent. So it's thought that in order for DHA to its job, you need adequate methylation status so that all those processes can run. And if you only have one or the other, then you won't see benefit. Got it. Yet another reminder for long term listeners, this will come as no surprise, but you gotta get blood tests, comprehensive blood tests, and really track this stuff with trend lines over time. But that's a much longer conversation, but suffice to say, you need the orchestra, right? Or you need multiple legs of the stool. It's not just one leg of the stool. All right. So let's maybe return to, I'm going to use a term that's a little dangerous to throw around, but kind of first principles or fundamentals maybe is a better way to phrase it. I'm terrified as many people are of this thing called Alzheimer's disease. And you could throw in dementia, cognitive decline in general, and conversely, very interested in extending health span. I'm not totally convinced that, you know, we're going to get to one hundred and fifty years, two hundred years, like all the tech billionaires might want to have us believe, but it does seem, certainly if I look at my own health span kind of local maximum right now for myself, it's not really low, but just capacity right now compared to prior generations, I feel very good about it. So I feel like I can extend that runway. And cognition for me is just the most, one of the most, maybe the most important pillars of that because having seen multiple people disintegrate cognitively, they don't just lose their ability to remember. They basically lose their identity. They lose their ability to emote. It's a loss of the self. I mean, it's a death before death almost in a way. So really would love to do anything possible with the right risk benefit ratio to avoid it. But fundamentals, should we talk about I'm gonna fuck this up. August Dieter? Augusta Dieter? Data? How do you say this name? August Dieter, I think. There we go. Yeah. Alright. Who is this person? Because a lot I'm guessing most folks will not recognize the name. Certainly, I didn't recognize the name. Hadn't seen it until I got a couple of notes from you prior to hopping on. So August's detail, or if you read some of the original papers, August d was Alzheimer's index patient. So Alois Alzheimer, that Alzheimer's disease is named after, was a psychiatrist in the early twentieth century, and he took a particular interest in individuals who had sort of rare or unusual cases of pre senile dementia. So what we now call what now most of us call Alzheimer's disease, which is sort of a late onset dementia, was called a senile dementia, which just meant that it occurred after 65 years old. That was not what Alzheimer studied. He studied unusual dementias where people who were quite young, sort of in the, you know, forties or fifties, experienced significant cognitive decline and dementia, and August Dieter was one of them. He then, after studying them as a psychiatrist or working with them as a psychiatrist after they died, he then looked at their brains under a microscope. So he was the first person to see amyloid plaques, tau tangles that are now sort of pathognomonic. They're like what we consider to be sort of required as part of Alzheimer's disease. But it's just interesting that what we have now is not what he studied. So over time, people thought that the brains of individuals who had this sort of early onset Alzheimer's or these early onset dementia that Alzheimer studied and those who have these late onset dementia that we now call Alzheimer's disease, those brains looked very similar under microscope, so they've kind of lumped together. Although we do still have two kind of broad forms, the early onset Alzheimer's, which is usually a single genetic mutation in something like a presidiline gene or the amyloid precursor protein gene that then creates a picture that's much more like what Alzheimer's studied or the late onset Alzheimer's, which is what most people think about when they think about Alzheimer's disease is probably somewhere between ninety five and ninety nine percent of cases of Alzheimer's. And there is a genetic component to risk, but it's usually much more tightly tied to lifestyle and the environment and other lifestyle factors that that we have some control over, hopefully. And the reason why Auguste Diza is interesting to me is because I don't think she actually had Alzheimer's disease as we would now think of it. There were being groups that have taken sections of her brain from, like, you know, Alzheimer's old collections, and they've done genetic studies. And she didn't seem to have any of the genes that cause early onset Alzheimer's disease or any of the mutations that cause early onset Alzheimer's disease. She wasn't an APOE four carrier. I think she was three three, if I remember correctly. So she didn't have any of the genetic risk factors. So what caused this and caused this so young, I think she was in her fifties, right, is still actually unknown. Some people think there have been some, like, recent retellings of the story. Some people think that she may have had neurosyphilis, and neurosyphilis actually causes amyloid accumulation. It looks very similar to Alzheimer's disease. Neurosyphilis, meaning she had syphilis and It got into her brain. Got it. Yeah. Mhmm. And that can look very similar under a microscope, especially a hundred years ago or more than a hundred years ago when we were just sort of first starting to look at brains under microscopes. And then others suggested that it could have been more sort of psychiatric. Nutrient deficiency is certainly very common. Could have been, you know, just like the the, you know, other components of her environment. She was, by all accounts, sort of like a downtrodden housewife that maybe didn't get sort of much engagement or stimulation or, you know, wasn't particularly well treated at home, and that could have sort of precipitated of it. And we don't actually know, but many of these things kind of it just seems interesting that it's probably quite likely she didn't have Alzheimer's disease at all. Wild. Alright. So I'm gonna take this in a few different directions. And as per usual, turn it around to be self serving for yours truly. But I'm going through some of the notes that I had for our conversation, and I'm sure I will have mentioned this in the bio and intro at the very top of the show. But I have this bullet in front of me, and I just wanna make sure this is something you feel is defensible. Forty five to seventy percent of dementia is preventable through lifestyle. Is that a defensible statement? Yes. As far as we think it can be defensible. Yeah. I'm not trying to put you in the hot seat. I'm just saying, like, I don't know where that number comes from. So I can tell you where that number comes from. I mean, that sounds great. Yeah. I mean, that seems like a ray of sunshine in a pretty gloomy possible conversation. Right? Where people think you're just like, okay, there's genetic determinism. You got this thing and you're screwed. If you have a bunch of it in your family, you're also screwed, etcetera. But it seems like there's a lot you can do to right the ship for a period of time. Okay. So where does forty five to seventy percent of dementia is preventable from lifestyle? Where does that number range come from? So forty five percent comes from the most recent edition of the Lancet Commission report on dementia prevention, which is overseen by professor Jill Livingston and brings together all these different experts in dementia and its risk factors. And they sort of scour the research for observational studies and then as much as possible interventional studies. So a lot of it is, you know, epidemiological data. Looking at different risk factors that have a consistent relationship with dementia risk, and then you do these sort of statistical calculations to look at something called population attributable risk, which is essentially saying, if I eliminated this risk factor entirely from the population, what percentage of dementias would I expect to no longer happen? That's essentially what it means. And all of these different percentages add up to forty five percent. So it's a couple of percent for smoking. It's seven percent for low level of earlier education. It's like a percent for alcohol. Then there's hypertension, hearing loss or sorry, high blood pressure. Hypertension is a fancy medical word. High blood pressure, hearing loss, obesity, low physical activity, and all these different percentages add up to forty five percent. There are some things that are on that list or that aren't on that list that I think should potentially be included. So, like, sleep loss or poor sleep and insomnia is not included. Late life physical activity was discussed in the report, but was not included even though there seems to be some good evidence there. So, actually, that suggests that there may be more than forty five percent that are preventable. And there are other studies, like, there was one big study done from the UK Biobank data by professor Yoon Tai Yu that estimated that up to seventy two percent of dementias were preventable. If this was gonna happen, this would require, like, a complete societal overhaul because a lot of this risk comes from low socioeconomic status, low educational and work opportunities, like all these other things that are kind of baked into societal risk for dementia. But others are things that we have more control over, like level of physical activity, whether we smoke, whether we drink. So some is directly under our control. That's probably something like fifteen to twenty percent, maybe more, and some is kind of driven by these maybe biggest kind of societal risk factors. But if you did all of that and we managed to completely change how everybody lives and all of these risk factors, the ideas that, you know, maybe even up to three quarters of dementia cases could be entirely prevented. Now that's very different from saying that I could guarantee that you will not get dementia. Right? That's not the same thing. We're talking about this stuff at the population level. And I I have to say this because if I talk about, you know, physical activity or sleep or nutrition, and these are really important for dementia risk, somebody will always say, well, my family member did all that stuff, and they still want dementia. So we're talking about probabilities. We're not talking about, I can definitely guarantee that somebody will avoid dementia, but I think we can definitely say you can stack the deck massively in your favor through a whole variety of actions that should decrease risk long term. Alright. So part of the reason that I make this very self interested is because I'm self interested. The other part is that I think the personal is very easy for people to concretize, right, for themselves. So they can interrogate how they're behaving, what they might do differently, what they might add, what they might subtract. So let me tell you some of what I am observing and then some of what I'm doing, and I would love for you to identify or maybe speak to things that are low hanging fruit or reasonably accessible that are missing. So a few things. Lots of folks in my family currently who I'm caring for in one way or another deteriorating very quickly with what has been called Alzheimer's. Again, kind of a tricky diagnosis, not sure how much they're actually looking at, whether it's beta amyloid, tau, or anything else. But certainly in some cases, these blood relatives are APOE three three. So I'm like, Also raises the question of, is there an undiagnosed infection? Maybe it's an STI. Who knows, right? Like, I don't know what the answer is to that. It's kind of another line of testing, perhaps. So I've been trying to do a few things for myself, recognizing that if someone starts to really show obvious symptoms that can't be easily explained away in their seventies, let's just say the process probably started what decades earlier, right? I mean, the cars have started to pile up. The machinery has started to break a lot sooner. So it would seem like the earlier you intervene with better lifestyle changes, etcetera, the better off you'll be. So I've got the fasting and the ketogenic diet and all of that stuff, right, which I do regularly. They've got the exogenous ketones, which like you, I use sparingly. I don't use them all the time because particularly like before this conversation, I took eleven milliliters of a ketone monoester. But I think once all is said and done, it's basically fifty one percent onethree butanediol, and I have some concerns around onethree butanediol specifically in chronic use or at sufficiently high doses, say thirty plus per day. So I tend to use it for special occasions like this, you know, toast, have a glass of champagne, have some exogenous ketones and off to the races. All right. So there's the ketone piece, which I think is non trivial. There's the, for the most part, avoiding crazy glucose spikes all the time. Right? Occasionally, I'll have like Christmas. Sure. Add a bunch of cookies. Like who cares? It's Christmas. It's fine. Add a bunch of pie. But I have a CGM on right now. I had a continuous ketone monitor on at the same time for about twenty eight days. I'm really interested to look at all of that, but I'm generally following like a slow carb diet or Mediterranean style diet. I am getting enough omega three. I know that because of fish intake and also when needed, supplemental intake. I do seem to be a poor methylator, so I'm taking B vitamins, L methylfolate, all of that stuff. Tracking blood once a quarter, so I've got super comprehensive stuff on that side. Zone three training, I do find it as boring as watching paint dry, even when I'm listening to a podcast or watching a Netflix mini series or something. But probably doing two to three sessions a week of, let's call it thirty to sixty minutes, walking every day, lots of walking. And we'll come back to that because actually, I can't resist. We probably will come back to it, but walking 4,000 plus steps a day reduces dementia risk twenty five percent, optimal 10,000 steps daily, and then reverses hippocampal shrinkage, 2% increase versus expected one to 2% decrease. That's the bullet that I highlighted. And then weight training a couple of times a week. I could keep going. I'm not going to bore people to death with this Doctor. Evil life story, but I will say that I've also wanted to get a snapshot of what things look like. So I've I'm going to be having a call. I won't mention the company by name because I haven't done all of my due diligence. They have some scientific advisors who I think are very credible, but have done brain MRI. I've done the blood draws, the DNA tests, everything else. So I'm APOE 3.4. And looking at the brain MRI, I mean, I'm a muggle, right? So I probably shouldn't be allowed to sort of grab the wheel when driving on the MRR reading, but I want to look at the data. It seems like, and who knows how defensible this is, but my MRI predicted brain age based on hippocampal volume, etcetera, etcetera, etcetera, is 46 instead of 48. So I wasn't thrilled about that. I'm like, well, all right, not sure what else I can do. Maybe a flood dose of Ibogaine. Actually some pretty interesting data around that from Nolan Williams, but not something I would recommend to most people, including myself. So there's that. Did a whole battery of cognitive testing through this startup. Now that came in at brain age of twenty years predicted, twenty eight years younger than your chronological age. But you can kind of beat the test. Like there's some gamification, so I don't know how heavily to weigh this. Right? So brain age of twenty years. Man, sounds great. There are certain aspects that are harder to game, like reaction time testing. Okay. So I had, like, two hundred and sixty seven milliseconds, basically versus four hundred and six milliseconds. Okay, great. There could be some training effect, like learned training effect, but then there's, like, number span, focus. I won't bore everybody with that, but word pairs, names and face pairing. With mnemonic devices, if you train yourself, you can really sort of game the test. And TBD on like proteomics, I'll be getting all sorts of stuff drawn to try to get an accurate baseline of where I stand now so that I can measure all of the effect, hopefully, of these interventions over time. Just a quick thanks to our sponsors, and we'll be right back to the show. Sleep is the key to it all. It is the foundation. Many of you heard me talk about how today's sponsor, Eight Sleep, has improved my sleep with its pod cover. Well, they just launched their latest product, the Pod five. I cannot wait to try it out, and here's why. The Pod five introduces Eight Sleep's latest product, the blanket, which uses the same technology as the pod's cover to extend temperature regulation across the entire body. So if you're too hot, too cold, you can fix it. If you're a couple and one of you is hot, one of you is cold, you can fix it as well. It all fits right over your existing mattress like a fitted sheet. On average, members report the pod has helped them fall asleep 44% faster, 34% deeper sleep, and given them up to one added hour of sleep each night. Also, the pod's snoring detection, my friend Albert might be interested in this, An automatic elevating platform have reduced user snoring by 45%. So it does a lot. You'll also get a personalized report each morning, allowing you to track your sleep stages, heart rate variability, respiratory rate, and more, all without having any devices strapped onto you. So head over to 8sleep.com/tim and use code Tim to get $350 off of your very own Pod five Ultra. You can try it at home for thirty days and return if you don't like it. So why not give it a shot? Sleep is everything. Again, that's 8sleep.com/tim. You can spell it out, 8sleep.com/tim for $350 off. Shipping is available to many countries worldwide. One more time, 8sleep.com/tim. Listeners have heard me talk about making before you manage for years. All that means to me is that when I wake up, I block out three to four hours to do the most important things that are generative, creative, podcasting, writing, etcetera, before I get to the email and the admin stuff and the reactive stuff and everyone else's agenda for my time. For me, I need to find people who are great at managing, and that is where Crescent Family comes in. You spell it c r e s s e t. Crescent Family Office. I was introduced to them by one of the top CPG investors in the world. Crescent is a prestigious family office for CEOs, founders, and entrepreneurs. They handle the complex financial planning, uncertain tax strategies, timely exit planning, bill pay, wires, all the dozens of other parts of wealth management, and just financial management that would otherwise pull me away from doing what I love most, making things, mastering skills, spending time with the people I care about. And over many years, I was getting pulled away from that stuff at least a few days a week, and I've completely eliminated that. So experience the freedom of focusing on what matters to you with the support of a top wealth management team. You can schedule a call today at cressetcapital.com/tim. That's spelled cresset. Cressetcapital.com/tim to see how Crestet can help streamline your financial plans and grow your wealth. That's cressetcapital.com/tim. And disclosure, I am a client of Crescent. There are no material conflicts other than this paid testimonial. And, of course, all investing involves risk, including loss of principal. So do your due diligence. What would you say are, like, there are 20 things I could mention, but, like, here are three or four that I would also pay attention to. So first, a couple of comments on all the stuff that you mentioned about what you're currently doing. So I think I've already mentioned that. I think that there's a lot of promise for ketones. I'm not sure that ketones necessarily have to have a place in prevention, and I'm not sure that you would necessarily need them from a prevention standpoint. There are some reasonably good data. So, like, the medium shade triglyceride work from Steven Cunaine's lab is quite compelling. In early Alzheimer's disease, taking MCT oil seems to increase the c two s they uptake into the brain. This is associated with improvements in cognitive function, and this is overcoming what looks like an energetic deficit in individuals who have Alzheimer's disease. And this is something that, again, is one of those things that are pathognomonic. Right? We think that we see this, and this is, like, kinda, like, part of the picture of Alzheimer's disease. We see that, like, this is Alzheimer's. Can I pause for one second? Yes. Real quick. Don't lose don't lose where you are. We're talking about MCT oil. Number one, if people wanna play with MCT oil, be close to a bathroom when you start. And if you combine it with double espresso and creatine, definitely have some depends around. The second is the ketogenic diet for me, just to briefly provide a little more context, is also for its, I think, plausible anti cancer effects and just kind of all cause mortality plus mental acuity. I just think a lot faster when I have more metabolic flexibility with something like intermittent fasting. That's another thing I do a lot of where my body is has just got the machinery to produce ketones. But, yes, I hear you. Okay. MCTs. So the thought being here, right, there's a difference between what you find works really well for you versus what the listener thinks they should have to implement for themselves. And so I'm now going down the road Yep. The road of why I don't think we all need to be in ketosis to prevent dementia. Yep. So I think from a therapeutic standpoint, seems to be beneficial overcoming this energetic deficit that we see in Alzheimer's disease, particularly early Alzheimer's disease, or maybe it's easier to overcome earlier on. And one of the ways we look at this is with something called a PET scan. So you do an FTG PET. You give labeled glucose molecule. You inject that. You see how much gets into the brain. In individuals with Alzheimer's disease, less glucose is getting into the brain. We've traditionally come at it from the point of that glucose can't get in. Right? There's some kind of metabolic disease, insulin resistance. This is where the idea of type three diabetes has come from, right, instant resistance in the brain that glucose isn't getting in. But a PET scan cannot differentiate between the glucose can't get in versus the brain isn't asking for that glucose in the first place. And there are actually some very nice studies that looked at brain activation and glucose uptake in response to cognitive stimulus in individuals with Alzheimer's disease. And what they see is that, yes, at baseline, there's less glucose being taken up into the brain of individuals with Alzheimer's disease. But if you stimulate that brain cognitively, it can take up glucose just fine so that you get into the range of a normal healthy brain in early Alzheimer's disease. Once you get to, like, advanced stage dementia, it's too late. But at that early stage, I think part of the reason why we're seeing less glucose uptake is because those parts of the brain are less active because we're just not using them as much. And just like glucose uptake into the muscles, which is demand driven, you work your muscles, they ask for more glucose, they take more up. The brain seems to be the same, at least early on. So I think we think a lot about the supply side, right, the energetic supply side, But I don't think we think enough about the demand side, how to create energetic demand in the brain such that we are maintaining glucose uptake, maintaining energetic state, and then doing that also maintains all the metabolic machinery that you really care about in terms of long term function. Alright. So if I'm hearing you correctly, and this is something I've, you know, chatted with Dom D'Agostino about, but I'm wearing this CGM. So I've got this device on my arm that tells me what my glucose levels are at any given point in time with whatever, three minutes sampling or something like that. You gotta calibrate that with a finger prick, by the way, folks. But if I eat a meal and then I don't go for a walk, my glucose spikes, and I might conclude, wow. My muscles are really not accepting glucose. My muscles are bad at accepting glucose, but that's not actually true in my case. Right? If I go for a walk or I do some light exercise, I guess it's like GLUT4 transporters or whatever, get all jazzed up and help that glucose to be better disposed into muscle tissue. And like you said, in the case of the brain and people referring to Alzheimer's as type three diabetes, it's like, wow, the brain can't use glucose, or it's very bad at using glucose. But if I'm hearing you correctly, the additional question that they should be asking is, is it just that, or is the brain not asking for glucose, the equivalent of the GLUT4 transporters? Like, is the brain basically offline? It's a car up on blocks, but if you take it down, like, yeah, it's going to use gasoline just fine. If that's the case, I guess it's just a call to action for more stimulation of the brain. And when I was first just coming across your notes that you sent prior to this conversation, I went on chat GPT, and I was like, what are the most glucose intensive activities for the brain? And they gave me a bunch of mental exercises, which isn't exactly what I was looking for, but I could have prompted it better. And it said, but even still, the sort of improvement or increase might be plus less than 10% in terms of the total. And then I was like, well, are there other activities such as physical activities that might increase glucose uptake in the brain? And it gave me a whole list, But rather than regurgitate that, are all types of stimulation created equal, or are there some sort of eighty twenty analysis like, okay, there are some tools that are better for the job? Yeah. So when looking at this purely in relation to glucose uptake, those data don't exist. So I'm gonna have to extrapolate further than that. And I think that's important because a decrease in glucose uptake is just a signal that that area of the brain isn't as metabolically active, which means we're just not using it as much at the simplest level. So then if you think about various activities that we could use to stimulate the brain, which do seem to be protective in various different ways, both they can enhance cognitive function in the short term and then protective against dementia in the long term. This ties very nicely into the comment that I was gonna make about your physical activity routine because this is where I think some things could be layered on. When you look at the different physical activities and or exercise and and how they affect the brain, different types of exercise affect the brain differently. So you certainly need a smorgasbord of all of them to kind of get a global support for the brain. But something that seems to be particularly beneficial is coordinative exercise or open skill exercise, you know, plus or minus things that have a navigational component. And these are essentially sports or activities where you're constantly having to respond to the environment and adapt. That's what makes them open skill rather than closed skill or unimodal exercise like going for a jog or sitting on a bike or something like that. So when they compare sports or activities that have the same amount of physical challenge, but a different amount of cognitive challenge because of the open skill nature, you see greater benefits in terms of brain structure, improves in cognitive function. And open skill just means high level of unanticipated variety or variety? What is that? Both. So it basically has a greater amount of complex motor skill required. Some of it can be learned. So dancing is one example. Right? So could you learn the steps of a dance? Single strongest activity for dementia prevention. Am I overstepping there? Yeah. Probably. If you look at physical activity and the effect that it has on cognitive function and also One of the mental health. Yeah. But in terms of both, mental health, so studies in depression as well as studies looking at different activities that people do and the risk of dementia and studies where they randomize people to different types of activity, including dance. Dance seems to have the the highest sort of effect size compared to other types of physical activity. But there's multiple components to dance. Right? So you have to learn the steps, but there's also a social component. There's a music component. All these things are probably the black part of the magic sauce together. But open skill sports also include board sports or ball sports or team sports where you're having to, like, react to the environment and other people around you. Do you say ball sports like rodeo? What are we talking? No. Oh, ball. Ball. Ball. Ball, b a r o k o. Also good as long as you don't get punched in the head a bunch or kicked in the head a bunch. Or choked out too much. Choked out too much. So beyond the, like, the physical strain that these exercises have, they seem to have an additional aspect of requiring reaction speed, challenging processing speed, you know, learned complex motor skills. They seem to have an outsized effect in terms of cognitive function. Something else, this is kind of an aside, but just based on the physical activity component, when you're looking at more aerobic or, you know, even, like, close school, unimodal running, cycling kind of sports, the benefit seems to be intensity dependent. So, yes, if you're not doing anything, then going for a walk and walking a certain number of steps a day is gonna be great beneficial, decreased dementia risk. Absolutely. But looking at hippocampal structure and function, for instance, which you mentioned, right, you're talking about measuring your hippocampus on an MRI scan. Higher intensity activities seem to be better. So probably the longest study where they they ever did something like this, they had people this is an Australian study where they had people do the Norwegian four by four protocol three times a week for several months. Oh my god. And so for anybody who doesn't know what this involves, it's four sets of four minutes on a treadmill at 85 to 95% of your maximum heart rate. With four minutes rest, you do that four times. It is miserable. I mean, that's like pretend like you're being chased by walls through the snow for four minutes, and then take a four minute rest and then do that Yeah. Four times. Yeah. Okay. Right. But they saw significant improvements in hippocampal structure and function that were maintained for several years after the end of the trial. Several years. Several years left in the trial. So so a few months Yeah. And then sustained for several years. You think they opened up for five years after the end of the trial? That makes it much more interesting. Okay. And I think a lot of this is driven by lactate. So when we talk about the various things that support the brain through exercise, we often talk about BDNF, brain derived neurotrophic factor, which is increased with exercise. But the BDNF that you produce that you can measure in the blood that's produced by the muscles during exercise doesn't really get into the brain very readily. Most of the BDNF we have in the brain is produced locally, and it's actually driven by things like lactate. So lactate does get into the brain. The more lactate you have in the blood, the more it gets into the brain. And then that acts as a histone deacetylase inhibitor that activates the blood sugar BNF. Ketones do the same thing. Osteocalcin, which is released when we sort of load the bones structurally, rise released from bones, seems to do something similar. So generating lactate seems to be beneficial because probably because one of the things it's doing is it's generating more BDNF that then is associated with improvements in hippocampal structure and function. So as long as you're doing sports that have some high degree of intensity, so you're regularly producing lactate and then either in the same sport or separately doing these sort of high skill, high reaction time, open skill kind of sports, that's probably gonna be beneficial from a exercise standpoint. I'm still completely stuck on the three times a week with basically VO two max training. Right? Yeah. For a few months, is a few months, like, three or four months? Or how many months was it? The study was either six or twelve months. I can't remember the the intervention period. It was one or the other. And with durable effects over a follow-up period of five years or something like that. Like, that is a great investment. That makes it much more a much more compelling sales pitch for me. And, like, I've done plenty of VO2 max training in the past, but, like, it's not necessarily fun. Right? I mean, I mean, I will say, if you can, again, avoid getting your arms snapped, exhibit a right here with my elbow surgery. But if you can avoid the breaking limbs and getting choked out too frequently, something like jujitsu, right, is actually fantastic because you might have three to five minute rounds, and then you take a break for a round, and then you go back in. And chances are, depending on who you're rolling with, it's going to be pretty intense. Obviously, it depends on how competitive the gym is. But the durability is just remarkable. That is really, really, really, really interesting. Now, is the threshold for sufficient intensity? I imagine it varies tremendously from person to person, depending on lactate threshold. Right? But like for you, do you need to do something approaching the Norwegian four by four to cross the threshold sufficiently in your mind, or does something less suffice? The problem with having just one I mean, it's one very good study, but just having one study on this is that we get really focused on the protocol. But I think that anything that is regularly producing, you're getting above your lactate threshold. You're generating significant you know, several millimoles of lactate. I don't think people need to measure it. But, you know, if you're getting six, seven plus, something like that, right, you're you're definitely gonna be in that range. Is there something like a people use a talk test, for instance, Peter Tia talks about this for zone two training, where you can kind of have a conversation in belabored short senses, but you don't really feel like it as an indicator that you may be roughly in zone two. Is there an equivalent for that range of lactate? Not that I know of. 10% from puking into a bucket? Yeah. Because it's it's definitely gonna be misery related. So if I think about, a lot of the training that I did as a student was I I was a rower. Right? And this is something Brutal. You love misery. I'm actually I I don't love misery enough, which is why I probably why I wasn't as good at rower as I could have been. But there are lots of protocols where you're doing relatively short sprints with relatively long rest periods that still generate large amounts of lactate. And so in studies where they've done this, you know, you're talking about thirty seconds flat out on a bike or a rowing machine with several minutes of rest times six, eight, 10 rounds. By the end, you can generate a lot of lactate without having to do something continuously for, you know, several minutes at a time. I was just reading that one of the favorite training protocols for one of the, like, world champion rowers was forty five seconds flat out, like, completely flat out on the right machine within six minutes of recovery, but doing that, you know, several times. And then at the end, you're generating several millimolar of lactate. So I think anything like that that's gonna get you in that zone. It just requires maximum effort for even just, like, twenty to forty something seconds. Even with several minutes break in between, you're gonna be hitting that. So I imagine the gold standard, do you have some guy in a lab coat and with a clipboard who pricks your finger or something and does these blood draws to determine the millimolar concentration of lactate? Is there a breathable option as there is with ketones, right, where you can measure acetone through something that looks like a breathalyzer as opposed to a finger prick for BHB? Is there something that is does anything like that exist that would make it a little No. They're they're working on continuous lactate monitors just like you would have. And some people do sort of have those they're right near being commercially available, so some people do have access to those already. But equally, I would argue that it doesn't matter that much. Just like go and do something really, really hard for a short period of time and do that a few times over and do that relatively regularly. Like, that's probably enough majoring in the minors that that you need to do to to kind of get that benefit. Sounds like my sled assignment. I do love my sled pushing and pulling. You can definitely wipe yourself out with that stuff. Yeah. Okay. Alright. Without necessarily the impact of me trying to run from wolves on a treadmill or something. Okay. I do wanna take a brief commercial break, but it's not for any sponsor. It's just to mention then then we're gonna kinda dive straight back into the programming and discussion. But you have a book that is coming out shortly called The Stimulated Mind. It goes through all the stuff we're talking about and a lot more. People should pick it up. That's Doctor. Tommy Wood, obviously, but the stimulated mind, there's so much horseshit and charlatanism floating around out there in the world of anything related to cognition and memory. It's part of the reason it's going to segue is a little awkward, but part of the reason I wanted to have you, I was like, that's part of the reason I wanted to have you on is not to highlight necessarily that, but the antithesis of it, which is someone with real clinical expertise, research credentials, who is also a practitioner. Right? It's like you walk the walk. And I wanted to ask you, you mentioned supplements earlier, and, of course, everybody loves to hear about supplements. But what are some that may not be on the usual list of suspects, so to speak? I mean, one I I would love to hear you speak to is CDP choline. People might not think of Xylitol as a supplement, but certainly you could argue that maybe there's a place for it. Do you wanna add anything to that and just expand on those? I think that the supplements that we have the best evidence for are really they start with those core nutrients that we could get from the diet. But if we don't, then we definitely should supplement. So we've mentioned omega threes, b vitamins, especially those involved in methylation. So that's vitamin b twelve, folate, which is b nine, riboflavin, which is b two, and b six. Vitamin d, obviously, critical. Iron supplementation, particularly if people are anemic. So that requires a whole assessment for, like, why you're anemic in the first place, but often particularly more common in women. And many of the symptoms that women may experience around perimenopause are associated with inadequate iron status. So getting your iron status, checked and addressed is really important. Magnesium, certainly critical as well. If we're thinking about other things that do seem to have both an acute and long term benefit in terms of cognitive function, then all the kind of antioxidant polyphenols are very interesting, particularly those that come from berries, but related ones in coffee, tea, on the skins of roasted nuts and seeds, like, they have similar effects. And then so you mentioned choline. And right at the beginning, when we were talking about omega threes, I think choline is critical because it's important as a head group for fats to be attached to in membranes. That's maybe one of the reasons why it's important for the brain. And various estimates suggest that we're becoming increasingly choline deficient as, you know, we stop eating things like eggs and liver, which are our richest sources of dietary choline. But there are randomized controlled trials in two different settings that we've talked about already. So one in older adults already experiencing some degree of cognitive decline where supplementing with CDP choline, which is also called citicholine, seems to improve certain aspects of cognitive function. And then, again, after traumatic brain injury, there are meta analysis that show that supplementing with CDP choline can improve some neuropsychological outcomes in particular after TBI. So I think most of us can probably get choline from the diet, but in some of these cognitively degraded states, you might call them, you know, something like five hundred to a thousand milligrams a day of choline seems to be beneficial. Do you take it, or do you just get it from eggs? I get it from eggs eggs and liver. And some seafood sardines have some choline in as do some whole grains, like oats have some, quinoa has some. So all of it kind of adds up. So I I don't supplement with the codeine. I do supplement with creatine. I don't have the perfect trial that creatine is gonna prevent dementia, but I think we've seen enough interesting data across depression, again, sleep deprivation. Sleep deprivation. How many grams do you take daily? What's your standard daily dose? Ten grams every day. Single dose or divided? Doesn't matter? So I take it all in one go in the morning. There's some evidence that suggests that once you get above five grams, you probably start to saturate creating the optic transporter so you don't maybe you don't take all of it up. But the reason why I take it all in one go is because I remember to take all of it in one go. Another reason is that I find creatine to be quite stimulating, quite cognitively stimulating for me. So when you took your ketones, I took my creatine before I got on this call. Took five grams of creatine too. And so if I take creatine later in the day, I don't sleep as well. It's very noticeable for me, but it's not that's not the case for everybody. Some people take creatine and they don't know it's a cognitive effect. They doesn't affect their sleep. So it's very different from person to person. So those are the reasons why I I just take it all in one go in the in the morning. Especially if you're gonna take over ten grams, twenty, thirty grams, you're probably best splitting it up into several doses so that you absorb more of it. Yeah. Thirty grams at one go also is tempting the gods to smite you with a really, really bad bathroom situation. So yeah. And a lot of people do mention GI side effects from creatine. I think some of that is due to the quality of the supplement that you're taking. Yep. I agree. So if you're taking, like, CreaPure creatine monohydrate, that's what most studies that have tested creatine have used. And there was actually a systematic review meta analysis that just came out that found that across all the studies they could find compared to placebo creatine didn't have any additional GI side effects. But also those studies use high quality creatine. Also, not all those studies use thirty grams. So you could certainly get to a point where you're gonna start to have GI effects based on those. Yeah. I think it also has to do with the fact that my bike, Polypharm, in the morning when I'm just getting booted up, it's like, I might be having the coffee plus the Creatine plus, you know, like sardines with MCT oil. Yeah. Yeah. I mean, there's a lot going into the cocktail of potential disaster, which you do acclimate to. Quick question before I forget. On lactate, is there any argument to be made for anything that you would ingest or otherwise put into your body, not to avoid doing the intense exercise, but to increase the amount of lactate that you uptake into the brain. Is that something that people have looked at, or is that just risky business and to be avoided because you'll end up in, like, some type of acidosis or some other problem? So people have looked at exogenous lactate itself. Right? Usually, it's lactate salts just like you people have looked at ketone salts. You can bump up blood lactate a little bit, but similar to ketone salts that you don't get nearly the the increases you do with with with other compounds. You don't need to do anything to increase brain uptake of endogenous lactate because the brain will generally just take up as much as you've got similar to ketones. Right? I think I I didn't ask. I misspoke when I was asking the question. I guess it was just increasing the amount of circulating lactate so your brain just sucks it up like a vacuum. Yeah. I think you can make plenty of lactate yourself. So, you know, another way to do it, blood flow restriction is another great way to produce lactate with low load. There are some studies where the well, they have them do leg presses, but, like, sets of 20 leg presses wearing blood flow restriction cuffs will Oh, man. That will get you up there as well. Again, several millimolar of lactate lag. It's not fun. I think I think I'd rather do the Norwegians four by four. Yeah. Oh, wow. That's intense. So that's another way to do it. So if you, for whatever reason, don't wanna do sprints on a machine or you can you can probably get up there with some blood flow restriction under low load and high rep. But, no, I don't think there's anything that I would take to increase lactate Okay. Alright. Just because you can make it so easily yourself. Alright. So I wanna hop on the blood flow restriction because what make and model do you use? What's your kinda tool of choice for the BFR stuff? I use the BStrongs. So they have Excuse me? The the the the company is called BStrong. B e Strong. No. No. Capital b, Strong. Yeah. Oh, okay. Got it. I have no affiliation with them other than, like, I know some of the guys who buy that, but I paid for my device myself. So it has leg and arm cuffs, but it comes with a, like, a sphygmomanometer. Right? One of those blood pressure things to kinda pump it up to get the pressure. Those are the ones I use. Yeah. Nice and simple. I'm testing a few different ones right now. So when you travel, right, people think of exercise as this thing that involves potentially all sorts of machines and you need your kit. There can be a lot of excuses or things that people imagine as obstacles that are not in fact obstacles. So talk to me about your exercise when traveling with blood flow restriction. What does it look like? So as, my wife calls it, I'd have my gym in a bag, which I take Yeah. Everywhere I go when I travel, and it is a set of blood flow restriction cuffs and a set of bands. I use the Black Mountain products bands, which come with handles. Like, I like them because they come with a lifetime warranty. Like, I break them and snap them all the time, and you just, like, email them and be like, hey. This broke, and they just send you a new one. And they cost $40 or something like that. So super cost effective. For people who are not looking at Tommy, I mean, you're freaking giga I mean, you look gigantic. You're wearing, like, a very thick sweatshirt, and I can still see your pecs moving around for god's sake. What are your dimensions here? Not to turn you into, like, a playboy playmate or something. So I'm six two. I'm two usually, two hundred twenty pounds. Yep. I usually hang out somewhere around 12% body fat. Yeah. Strong unit. Okay. But the the reason that I brought that up is not to flirt with you, although I'm not not against that. I appreciate that. Yeah. Yeah. I'm against that. The no. The reason I wanna bring it up is people might think there's somebody out there who's, like, an Internet keyboard jockey on Reddit who who's, like, living in a basement and squats one thirty five, and it's like, oh, that guy must be some pencil necked dweeb. And it's like, no, actually not. He's pretty big. And yet, like, you can get, sounds like, a decent workout with bands that cost $40 and blood flow restriction. Yeah. How is that possible? What do you do? So when I travel because I'm usually at work, conferences, I'm doing podcasts, whatever. Like, I don't have two hours to go to the gym, which I like to have if I'm at home. So I might do ten to fifteen minutes. And right you put on the cuffs, legs and arms. I'll do some lunges, like bodyweight lunges, squats, presses, push ups, and then bicep curls and tricep extensions, and that's probably it. So a pretty standard protocol, which is essentially in three to four minutes, you accumulate somewhere between 75 and a 100 reps. So thirty, twenty, twenty, twenty, or twenty, fifteen, fifteen, fifteen, 15, something like that with thirty seconds of rest in between. Try and do one body part at a time, but you can superset them if you're kind of short on time. That's it. And kind of to your point, when we moved into this house, this was now eight years ago. I built my own gym here. But for a long period of time, I didn't have a gym, and I was working from home. And all I had was bands and BFR cuffs. And then it wasn't even the b strungs. It was like these really cheap ones that kind of look like something that we somebody would use to kinda, like, draw your blood. Yes. Like train spotting. Yeah. Yeah. Exactly. It looks like, it looks like a tourniquet, like, to to tie off your leg if you've, like, blown off your foot. And, again, they cost, like, $20. They're probably not the best. Anyway, so I had some of those and some, like, $40 bands, and that was all I used to work out for, like, four or five months, and I didn't lose any muscle mass or strength. I just got straight back into it afterwards. So, like, you can maintain and gain pretty well as long as you like, BFR can be, you know, a little bit painful if you sort of push it. But also very, very safe. Like, that that's it's been used in rehab. Right? All these other things that that frail individuals people who are like, what the hell are they talking about? Okay. So imagine you have I'll use an analogy. This isn't exactly what's happening. Right? But imagine you had a small belt, tiny belt that you put around your upper arms, right, under the shoulders, right at the top of the biceps. Let's just say, keep it simple. And then, I guess, close to the hip, right, on the on the legs? Yeah. Like, right up in the groin. And you're partially occluding blood flow. Right? So you're not totally cutting off blood flow, but you're making it a lot harder for blood to get to your arms and your legs. It's mainly blood to get out. So the blood can you're not get out. Yeah. You're not compressing the arteries where the blood gets in. You're stopping the blood from coming out. So The venous return. Yeah. Exactly. Okay. Got it. Yeah. And the net effect is if you're like Arnold Schwarzenegger and you're like, the pump. I feel like coming. Yeah. It's if you wanna take that to, like, a 20 x extreme and feel very, very, very uncomfortable, BFR is a great way to do it. Again, for people who are like, oh, come on, man. I squat three fifteen or whatever. Like, I'm guessing you probably squat, like, at least three fifteen or more. And what what do you squat? I'm curious now. My best squat it was a couple of years ago. Four zero five is my best squat. Better deadlifter than I am a squatter. What do you deadlift? What's your PR for deadlifting? 550. Yeah. It's up there. Alright. And I think you would probably agree, if you put somebody in leg cuffs and you're like, yeah, do proper lunges, like knee to the ground and go for, like, a 100 yards and come back. Like, I don't even think most people could do that, but it's just, like, you're gonna feel it. Right? Like, you are absolutely gonna feel it. Alright. Gym in a bag. We'll link to all this stuff in the show notes as well. So I want to list off a couple of things here and then talk about we can keep bouncing around a lot. Well, on these supplements, you know, I'm going to kind of cut this short and we'll put things in the show notes, but the periodontal health, mouth health, and dementia, right, the connection there, hence the use of xylitol, whether that's the gum, Epic, Kygum, or air purifiers, mouthwashes. We've got all this stuff. So I'm gonna link to that in the show notes just in the interest of time, and certainly feel free to chime in. I wanted to talk about cognitive stimulation. Right? So we spoke about dancing earlier. Could you speak to language learning and music? Because I'm realizing, I think accidentally, I might have really helped my brain a lot early, which is great as a surprise. But also have next to me an Ohana ukulele, which was gifted to me, that has basically just been gathering dust. And after doing prep for this and then looking into it, I'm like, you know what? I should spend a couple of minutes a day just screwing around with this. It seems like a great use of time, but could you speak to music and language learning? So this actually, if we include dance, this comes back to something that we kinda started talking about earlier, which is, you know, what are these experiences or what are these activities that you can do with the brain that kind of maximally activate it or increase glucose uptake? And there was a really interesting study that came out recently called creative experiences and brain clocks. Creative experiences and Brain clocks. Yeah. So I'll break that down into this it's different components. So kind of like when you did an MRI scan for your brain and and all those other tests you did, there were various different ways that people could sort of, like, estimate how old the brain looks. And I don't know if that's hugely BS or not. I don't know. It's a bit of both. Yeah. But in this context, I think it's kinda useful because when you think about what happens to the brain as it ages, there are a few things that happen. Right? The structure changes. Different parts of it gets smaller. Right? You lose volume. But then functionally, it also changes. The different networks that we have in the brain that have different functions and activities, they become less discrete, and they become more distributed. You get less of these kind of very functions specific tightly knit networks and connections. And then everything just, like, becomes a little bit more loose and different areas of the brain get connected together, and it's it's sort of like a bit more of a mismatch. You get this increase in entropy. Initially, what we call this brain entropy. Right? It's not as discreet. Entropy then decreases again as we get towards the end stage of dementia just because there's not much going on in there, unfortunately, anymore. Sorry. That's bad. That's the best way I can put it. Okay. And so when you look at different ways to quantify how old this brain looks, one way is to look at the structure and the connectivity of the networks and how, like, discrete they are. Things like the frontal parietal network, the salience network, right, the attention network. Like, these parts that are really important for, like, executive function, focus, attention, all this kind of stuff. And they tend to lose function as we get older. And the easiest way to do this is with EEG, so So electroencephalogram, where you measure the electrical activity in the brain. And so in this study, what they did is they took a whole bunch of different studies and they looked at these different creative experiences. So one was tango dancing. One was language learning. Then there was, musicians, they had artists, and they also had video gamers. And they had an interventional study where they had people learn the video game. And it was StarCraft was the game that they used just in case anybody was wondering. Although most if we're talking about video games as a cognitive stimulus, the one that has the best evidence is Super Mario three d World, just in case you you were interested. Lots of studies of that, actually. And what they did is they compared amateurs to experts, and then they also looked at the effect of an intervention where people actually were trained in this thing. And as you increase in expertise in these different creative complex arts, you see improved structure and discreteness of these, like, really critical networks that are susceptible to aging as we get older. So but the effect was similar in tango dancers versus those who are bilingual versus those who are artists versus video gamers. So there's some core effect of these complex, like, multisensory stimuli that require us to gain significant expertise and skill in order to perform them that seem to have this broad effect. So part of this is probably because we're training our brains to be able to focus and learn. And then part of it is just like the actual engagement in this complex task. And so when you look at, say, languages, two very good colleagues of mine at the University of Washington, Andrea Stocco and Chantal Pratt, they study individuals who are bilingual. And what they see, they've done this from both, like measuring brain activity and different types of cognitive function and then trying to, like, model, like, what's actually going on. And what it looks like is that those who grew up bilingual perform better on tasks requiring executive function. So things like response inhibition, which is you kinda want to do something, but you stop yourself just in time. Normally, when I talk about it, it's like, you know, when you have these thoughts of, like, oh, well, what would happen if I just opened this window and jumped out? Or you think something and you stop yourself just before you say it because it's a really bad idea because it's like your boss. How do they test that? Are they using, like, a Stroop test as a I'm just throwing something out there. So often it's like a go, no go task. You're presented with different stimuli, and it's whether you react to it or not. But, like, a Stroop is partly an example of that. But people don't know what Stroop is. Like You should explain it. Yeah. Yeah. So you you get shown words that spell a color, and they are also colored. And then you have to respond based on whether the word spells the color you're looking for or is the color you're looking for. And so it, like, requires you to juggle these multiple things. So, yeah, they they use tests like that. But, basically, it seems that because you spend your entire life having to suppress one language while you activate another and then move back and forward, your brain becomes better at suppressing these different so at the same time, interestingly, it seems you become less good at other things. So it's like, none of this is good or bad, but people who are bilingual seem to be less responsive to the what's immediately happening around them in in the outside world. And that's probably, again, just because of how their brains have adapted to these different stimuli. But you do see that those who are born bilingual or that who grew up bilingual have a decreased risk of dementia, or if they do get dementia, they get it later. But you also see improvements if you train in a language, even like using an app on Duolingo, they've shown that in older adults, you use Duolingo. And, of course, you have to, like, actually move through it, not just, like, stare at it for thirty minutes a day, but that you see significant improvements in executive function. You see the same thing with with music learning. So there is something to these complex, very human kind of skills that have these carryover effects into these kind of core components of cognitive function. I'd never heard about the response inhibition with subjects who are bilingual, but it might explain in a totally separate battery of cognitive testing that I did, which was much more rigorous, I think, than what I did a few days ago. My digit string memorization, despite all my mnemonic trickery, is very bad because it's only flashed for a second and then you have to do your best. If you gave me a bunch of time, I could use all my trickery. But if it's just a flash and it's kind of relying on, I guess, my hardware, then I'm very bad, like to the point where people might have some concern, but I've always been like that. Conversely, with something like this, there was a test that was pretty much exclusively the Stroop test, but I had a few things that were very similar. And I was like, I'm exaggerating, but like 10 standard deviations outside of the norm. Like I was so much better that they were like, why why are you so good at this? Like, we've actually never seen something like this. And it could be studying all these different languages. I don't know. Maybe. So do you know what? I'm I'm actually the same. And, like, we're kind of convincing ourselves that this is real just because it's it's the case for us. But I often do cognitive function tests on people we work within studies and that kind of stuff, and we do this full battery, all the things that you mentioned. And on every test, you know, memory, all these other things, I'm just like, I'm perfectly average. Right? And you kind of you always think that, oh, I'm so smart. So, therefore, I should be, like, what x standard deviation? But, no, I'm, like, perfectly average on everything except for response inhibition task or the Stroop test. Then I'm like and I also grew up speaking multiple languages. So I I don't hear that. Maybe that's the thing. We don't know. Which which languages for you? So I I speak Icelandic because my mom's Icelandic, so half my family are in Iceland. And then I lived in Germany and France when I was a kid for various periods of time. And then I did my PhD in Norway, and I taught in the medical school. So I had to learn Norwegian so that I could teach Norwegians medicine. Wow. That's hardcore. Yeah. That's quite a few. And for people out there who are like, well, I wasn't raised bi or trilingual, I didn't really even get started until I was 15, 16. Thought I always assumed I was very, very bad at languages for reasons that were mostly related to the schooling and not to any inherent ability. But I'm also thinking about tango as an example, because I spent a lot of time doing tango. That was I'm not sure if you have any familiarity with this chapter in my life, but in 2004, basically spent like six to eight hours a day doing tango in Argentina and competing ultimately and going to the world championships, all this craziness. But you have the physical component, but like you said, it's actually a pretty complex cocktail. And in my case, you you not only had sure. You have the dancing, but you also have Spanish. Right? I was learning Spanish at the same time. And then you have the music, and I'm wondering if studies have been done looking at the effect of listening to or having to track different types of music versus producing music. Has anyone looked at that? Not as much. Certainly, frequent music listening is associated with a risk of of dementia as much as you can, like and then cognitive decline as much as you can, you know, like, get rid of all the sociological pieces of, of that. There are some studies looking at training adults in musical theory, which requires actually listening to music and then pulling out the different components that seem to be, again, associated with similar benefits to, say, learning to play a musical instrument. So I think even some of that attentive listening and actually sort of engaging with the music as a listener seems to have some of the benefits in addition to, like, producing the music yourself. Yep. Except with dance, obviously, if you actually have a hope of dancing well, you have to listen very, very carefully to the music. And in particular, I mean, you could have choreographed dancing, but what interested me about tango, which I didn't realize in advance of getting to Argentina, is that the vast majority of it, tango de salon, is improvised. So if you're gonna compete in that particular style of tango, salon tango, you don't know what music's gonna be played, and then they just serve up whatever the songs happen to be. So you're not only responding to the music, but you're memorizing music. In In any case, it makes me wanna get back to Argentina. Maybe it's all that time off. That's why your hippocampus has been catching up with you. Yeah. Exactly. Oh, add that to my litany of complaints. So I wanted to highlight something. You've mentioned this. I don't think we need to spend a lot of time on it right now, but sensory loss, hearing, vision, right, getting aids slash surgery as soon as possible since those seem to be so correlated to increased risk or onset of dementia. I wanna mention two things, and then I'll let you rip. The second one is now I'm kind of paraphrasing here, but like error detection triggers adaptation. So like the importance of failure, because with a lot of the hand wavy, pseudo scientific games and this, that, and the other thing that are sold for helping supposedly, right, helping people with memory, cognition, etcetera, a lot of them don't seem to check that box. So maybe if you could speak to the sensory loss and then the kind of error detection and defining that and the importance of it. There are several studies that suggest that sensory loss, particularly vision loss through cataracts and hearing loss through age related hearing loss, presbycusis, are associated with an increased risk of dementia and that this risk is reversible. So if you have cataract surgery, then that increased risk is no longer there. And if you get hearing aids, again, that risk is no longer there. Of those two randomized controlled trials have only been done with hearing aids, and they only showed significant benefit in those who were at an increased risk of dementia for other reasons. So like poor health, cardiovascular disease, these these other things. So it may be that it's kind of exacerbating other underlying risks. But equally, we can think about two broad reasons why sensory loss might leads to cognitive decline and why often as people get older, they're like, I don't wanna get hearing aid because then I'll I'll I'll then I'm old. Right? Conceited defeat. Yeah. And so this happened with my mom, actually, and she recently got hearing aids. And I encouraged her. I was like, as soon as there's a thing that you need, you should get it. And it's had a dramatic effect on our quality of life. And so we know that if you lose an input to an area of the brain, that area of the brain is going to decrease function as a result. Right? It's no longer being used. And with the process of allostasis or constantly adapting to the demands that are placed on you, that part of the brain is just going to diminish its function. So that's part of it. But I think a a bigger part is that when you lose senses, you no longer engage in the world in the same way that you did previously. You go out of the house less. You socialize less. You do less tango dancing. Right? Because you don't feel like you can engage with it in the same way. So I I think there's a lot of benefit from recovering lost senses. That's not the same as so if you are born or if you never had sight or you never had hearing, that's not associated with increased risk because you learn to engage with the world in other ways. Right? So it's the loss of that engagement that I think is important. Then the error part, the easiest way to think about this is that if we're trying to improve function and structure of certain parts of the brain that allows us to have greater reserve, you know, greater total capacity. And therefore, if we do lose some volume or some capacity as we get older, right, we have more to lose. So, you know, we're less likely to get to the point where we have significant deficits. In order to drive improvements in structure and function, right, we need to drive these processes that we call neuroplasticity. New connections, new branches, all the supporting machinery, the other cells that are necessary. Right? We think a lot about neurons, but there's a whole bunch of other cells and stuff in your brain that are really important as well that are part of this response to stimulus. But to drive neuroplasticity, you essentially have to have a difference between capacity and expectation. The best way to uncover that is with mistakes or errors. So it's kinda like muscular training to failure. Exactly. Yeah. If you don't ever get to the point where you're no longer capable of doing the thing that you want to do, nothing needs to change. You can already Yeah. Yeah. Exactly. Doesn't need to adapt. Exactly. Yeah. So that's essentially it. That and this is what becomes important in dancing, learning languages, learning music. Right? Is that you having these opportunities to fail to kind of get beyond your current capabilities, and, like, that's what drives the processes of learning and plasticity. What else do you have in your personal regimen of kind of nonnegotiables? You got, obviously, you're lifting weights. You're doing your blood flow restriction torture every once in a while. I don't know if you're much of a ballroom dancer. You don't. I was I was a I was a a field raver in my youth, but I was never a ballroom dancer. Get that man some glow sticks. So, you know, I have a few part of the reason a big part of the reason I got elbow surgery was to get back into rock climbing, which I think is just a phenomenal, phenomenal sport for mental and physical development. I mean, it's just a kinesthetic puzzle on a wall. I mean, I was really inspired over the last two years seeing people in places like Colorado, Idaho, Utah, where I'd go into these gyms and you see people in their sixties and seventies who are doing stuff that I can't even imagine doing physically. And they meet a couple times a week. And I was like, wow, okay. If you can have that kind of longevity in this sport, like that seems like a great investment. Plus I just really, really enjoy doing it. But what are some other non negotiables, right? If you look at all the possible things you could do, all the things that you do, and you're like, all right, these are the things that are meaningful and that I stick with consistently, what falls in that bucket? Right? Because a lot of people will get these, like, 27 things, 47 things you can do to improve your brain health lists or whatever. And even if they want to do all of those things, there's no way they're going to. There's a question of sustainability or adherence as well. Yeah. What are some of the other nonnegotiables for you? The one that we haven't talked about that really is nonnegotiable is sleep. Yeah. Let's talk about it. I think this is the the major thing that's missing from these studies looking at dementia prevention, like, as a as a risk factor. I think inadequate sleep really seen in, like, so many studies now that's associated with increased risk of dementia. So that's something that I very consistently make sure that I get enough of. That's, like, the one thing that really is nonnegotiable. Like, I can I don't mind if my diet gets a bit crappy for a few days, or I don't mind if I can't get to the gym for a few days? Like, this stuff integrates over months and years. Like but if I can only focus on one thing, then sleep is really critical for me. But I will say one thing that I've noticed a lot was that historically, I used to really get in my head about my sleep. And I know this has been the case for many people who have tracked their sleep or use wearables or thought about the importance of sleep. Right. And so something that changed recently, particularly because I spent a lot of time looking at the research. And this also affected me at home because my wife is like, if you don't sleep and then you don't get your coffee, like, I don't wanna be around you because I'm the right picked up a moderate heroin habit. No. A lot of it was was honestly self induced because I I thought I didn't sleep well, therefore, I'm not gonna function well. I'm gonna be grumpy. Like, all this kind of stuff. And we know that this is influenced by outside factors. It's influenced by our own thought processes. There are studies that have shown this. You know, randomizing people to be told by their wearable they didn't sleep well even though when they slept just fine. And what you see, long term sleep is critical. Right? Absolutely. And any sleep you can get more than you are having now, the better. Right? So if you sleep six hours a night, you can get six and a half. Great. Like, don't think that you have to sleep eight hours. Like, if you can get an extra half an hour, that's amazing. But in short periods of time, actually, sleep deprivation doesn't have as much of a negative effect on cognitive function as we think. And this is just important so that we can go about our day to day lives and perform well when we don't sleep well. Especially when you have a chalk bag full of creatine at your desk. Yeah. But but so, like, yeah, the creatine helps. But equally, like, we travel, we have kids, right, all this kind of stuff. Sometimes you're just not gonna sleep well. But in short periods of time over, like, a few days, what happens is that processing speed slows down, but accuracy doesn't. So the quality of your work is just as good. It just might take you a little longer. And mood is affected much more than performance. So, actually, we don't perform less well. We just feel more grumpy about how we performed. So, actually, knowing this, I then, like, just completely changed how I approach my sleep. So if I didn't sleep well, I'm like, do you know what? I'm actually gonna be fine. Then it turns out I am fine. So that's like, yes. Sleep is critical, but how we think about these things, I think, is is really important. So, like, important factors are gonna be avoiding excessive alcohol, don't smoke. But then two things that that we you mentioned we haven't touched upon fully. I'll kinda, like, briefly talk about. One is air quality and air pollution, which is a significant risk factor for dementia. A lot of these studies are quite recent looking at, say, wildfire exposure and things like that. But even living near roads, like, in the short term is associated with greater cardiovascular risk, higher blood pressure, which you can improve with having an air filter. Of the all the different, like, metabolic type risk factors for dementia, high blood sugar and high blood pressure are the two most important. Lipids and other things are important as well, but those are consistently the highest risk factors. Managing blood pressure is really important. And if so you live near somewhere where there's a lot of air pollution, then air filters certainly seem to help there. And then oral health is the final one. So, like, I say this because I appreciate that I'm British, and I'm gonna tell you you should go to the dentist. So, historically, when I lived in The UK, I did not go to the dentist very frequently. And, actually, the first time I went to the dentist here in The US, I have this one metal crown from back when I was a medical student. And my dentist looked at it, and he was like, you didn't get that done in The US. That was his first that was his first comment. But gum disease to gingivitis, especially if it advances to periodontitis, is a significantly associated with an increased risk of dementia. This is probably both due to an increased, like, systemic inflammatory effect, plus those bacteria can get into the bloodstream. They're found in atherosclerotic plaques. In heart disease, they've been found in amyloid plaques in the brain. So treating gum disease is really important, whatever that requires. And that's why I mentioned xylitol to you because there are several studies showing that xylitol gum or xylitol mouthwash can improve the oral microbiota, decrease some of these cavity and periodontitis causing bacteria like strep mutans and porphyromonas gingivalis. So it's just like a really low risk kind of thing. There he is with his gum. Piece of gum in my pocket. A low risk thing to consider. And I don't think they've looked at it by APOE four genotype, but things that have an anti inflammatory effect or decrease inflammatory burden seem to have an out outsized benefit for those who are APO b four carriers. And so gum disease would obviously be one of those that's worth keeping an eye on. That's part of the reason not to keep banging on this drum because I know it's not the shoe that fits everyone, but that's another reason for my fascination with ketones. Just remarkably anti inflammatory on a couple of different levels. So for folks who might be wondering, and we'll put these in the show notes as well, air purifiers, do you mind if I just read from this email that you sent to me? Because, of course, I'm such a stickler. I'm like, what exactly make and model? So I'll just read from this. The blood pressure study I mentioned, this is I equals Tommy, used the HealthMate. That's one word. Jasper is good. That's j s p r. As are most of the BlueAir, one word, BlueAir models tailored to the size of the room. The Coway, c o w a y, AirMega is a good budget option. So we'll link to all these in the show notes. This is one, God, with travel, such a pain in the ass. Although I have, I think it was James Nestor who wrote the book Breath, who was giving me just some horrifying, sort of quantified self data related to looking at, like, CO two concentration in various hotels and airplanes and so on. And so he I I don't think he'll stay in a hotel that has sealed windows. I think it's kind of part of his policy. Yeah. High CO two really negatively impact sleep. Like, lots of people in a small room that's not ventilated, that can definitely negatively impact sleep. So we always have a window open or something for that reason. Yeah. Anything else that you do for sleep besides not becoming too orthorexic about it and, like, freaking out on the wearables and stuff, which is a real thing for sure. So besides recognizing that you're gonna be fine, humans have been dealing with this for a long time, What else would you say? Right? I would imagine, you know, there are things people have probably heard, like keeping the temperature. So this whatever it might be, like, 65 to 70 degrees Fahrenheit, etcetera. Other things that you find particularly helpful? Things that have helped me a lot. I stop work before dinner. I don't do work after dinner unless I really, really have to. And that that helps a lot because I find I ruminate a lot more if I if I do work late into the evening. A basic shutdown routine, I put on the blue light blocking glasses. They're probably just placebo at this point, but, like, I put them on and, like, my brain is like, oh, it's bedtime. And then I read fiction before I go to sleep. I have a quite recent purchase was an eight sleep, which has been amazing because I tend to get quite hot when I sleep. That's helped a bunch, so it's kinda helps stay cool. And then I I wear an eye mask, which I really like for, you know, blocking out light. There are also some very nice studies on that. One of my favorite studies looking at eye masks. You ever see this one where in the control group, they had them wear like a Zorro mask. So they were still wearing a mask, but, like, the eyes were cut out. No. And this was during the summer when light would come in early in the morning when it disrupt sleep, and they saw significant improvements in cognitive function in those wearing the regular eye mask versus, like, the Zoram other The Zoram? Yeah. So it's hilarious. That's probably my list. Got it. I'm gonna ask you something specific about sleep, but just because I have it in front of me to ask you, vitamin k two. Do you supplement k two, or do you get it from something else? I do generally supplement just like a few micrograms a day, maybe fifteen or twenty. But that's mainly because it comes with my vitamin d that I would supplement particularly in the winter. In the summer, I get plenty of sun exposure on bare skin, but in the winter, can't do that in Seattle. But I also don't mind a little bit of natto or, you know, some fermented foods that that would have k two in as well. So don't need to supplement. Stinky spider webs. If anybody likes the sound of stinky spider webs, try natto, n a t t o. It's the one that Japanese people like to give foreigners to watch the face. Some people like it. I can handle a little bit. I can handle a little bit. I mean, I grew up eating rotten shark in Iceland. So Ugh. That stuff is so fucking bad. I don't I I went to this place called Hotel Ranga, I think it's Ranga, to bring my family. You know, my mom had always, her whole life, wanted to see the northern lights. And so we went there in the middle of the winter. By the way, folks, not a whole lot of light. It's like twilight for a few hours. That's all you get. But there was some fermented shark celebratory day, and we drove to what looked like, and I think it was a gas station, but had a restaurant attached to it and ate this fermented shark. I don't even know how to how would you describe it? It was like, I mean, fermented shark as you would imagine, but, like, eating something soaked in, like, ammonia, like, the pungency when it hits your sinuses is like smelling salt. Yeah. Because it is ammonia. So to make Greenland shark, which is the type of shark edible so Greenland sharks don't have kidneys. So their tissue, their body accumulates urea. Right? Because they can't they don't pee it out. So in order to make it edible, that urea has to break down to ammonia, then it becomes edible in quotation marks. And so it is ammonia that you're tasting, but it's it's like it's got the texture of tuna and the taste of a really, really, really strong blue cheese that you peed on. I will say I wasn't really hankering for a return trip to that particular gas station to eat fermented shark, but watching my brother try to eat it was one of the most entertaining moments I'd had in a in a long time. So you know you're supposed to alternate shark with blend of bean, which is Icelandic aquavine. You eat the shark, then you use the blend of beans to take away the taste of the shark. You use the shark to take away the taste of the blend of beans, and then you just continue that until So you just get hammered enough that you don't care that you're eating fermented piss sharks. Exactly. But there is one thing that's so, actually, I I don't mind the shark that much. There's one thing that's much, much worse. If you ever have a chance to try, which is a Swedish fermented herring in a can, That is the worst thing I've ever put in my mouth. It's terrible. It's like when you open the actually, if you if you look it up, there are all these YouTube videos of people who, like, get it in The US, and they open it. And, like, the smell comes and they immediately throw up. It's like you open a tin and you, like, take out these, like, rotting bones of herring that you kinda put on bread. Highly recommended. Yum. Alright. I know what I'm doing for New Year's. Alright. So sleep. Do you have a position on the doras, on the, like, dual orexin receptor antagonists as because I've chatted with folks, including Matt Walker, who's, you know, very credible in the space with respect to sleep research. The potential that Doris could help with the clearance of beta amyloid, what is it, p Tau two seventeen, etcetera, and possibly be of some help in preventing the accumulation of things that later contribute to Alzheimer's. It's not like the vote is in and it's a 100%, but there seems to be some, a couple of interesting publications around it, including in humans. Do you have a position or any thoughts on it? So, like, very quickly, we know that sleep quality and quantity affect amyloid accumulation in the brain. That can be seen over short periods and long periods, and that's some of that work is from Matt Walker's lab. And he's even done studies that show that later in life, if you can improve the amount of sleep that you get, that's associated with a lower overall amyloid burden. I think that some of this like, we get very focused on amyloid. It's a part of the picture of Alzheimer's dementia. Just like you said, it's not the full picture. But I think we look at it, and it's a market for all the things that you should be clearing out of the brain when you sleep that you aren't. Right? Amyloid is one of those things. There are probably many other things as well. So the doors have, you know, now several studies in different states in insomnia, in sleep apnea, you know, these states where we know people are getting lower quality sleep, and they certainly seem to improve that. I think that in individuals who have some kind of sleep issue, be that insomnia, something else that's going to prevent high quality sleep, then improving that is certainly gonna be beneficial. Right now, the doors are now the best option. Previously, people recommended trazodone, which is like we talked previously, like, the least worst option because it doesn't negatively affect sleep architecture unlike many of the other sedatives that people might use to help sleep. But if you're sleeping fine or you manage to maintain high quality sleep as you get older, I don't think we need to start taking doors to prevent Alzheimer's because I think your sleep is probably already doing the job that it's doing. And there are studies that show that increased cognitive stimulation in older adults improves sleep quality or that engaging cognitive stimulating activities helps to offset some of the potential increased risk that we would have with poor or less good deep sleep, which is when a lot of this clearance happens. So I think a lot of the other things that we mentioned already, physical activity we know improves sleep quality. So I wouldn't jump straight to Dora's. But in somebody who who does have insomnia and say CBTI, so CBT for insomnia doesn't help them or some of these other things that we can do to improve sleep and those don't work and you've ruled out anything sinister, then, you know, I think they are now they're now our best option to help support sleep. Alright. We have covered a lot. I want to know why you decided to do something very difficult, which is write a book. The Stimulated Mind. What was the driver behind this, and who is the book for? I like to joke that the book is for anybody with a brain. The the subtitle is about preventing dementia, but, really, a ton of it is just about cognitive function and cognitive performance in general. So even people who are younger and aren't thinking about dementia yet. Although, like you said, it's worth thinking about it earlier than you think. I think for most people who think about how their brains work or want their brains to perform better and or want to prevent or minimize their risk of dementia long term, it's got what I think, the big rocks and the tactics for how to address those that we know substantially increased dementia risk, all those things we talked about earlier that kind of contribute to those dementias that are potentially preventable. And the reason I wrote it is because I didn't think that book really existed. Like people might focus on one particular area or they might focus on everything. Right. There are books on dementia prevention that are just like endless tables of blood tests and supplements and this stuff that just like most people are never gonna do. Right? It's not gonna be sustainable. I didn't really see a middle ground, but equally, I wanted it to be very heavily referenced. So if people wanna get into the references, I have a reference list. It's gonna be 2,000 papers all in humans, and it's cited in the text. Right? I have, like, little superscript citations in the text. The subtitle a little bit. It's a good subtitle. I've so I wanna give it some real estate here. So the stimulated mind, subtitle, future proof your brain from dementia and stay sharp at any age. I'm looking at the Amazon page for the first time. I hadn't looked at it. I had no idea that you know Kelly and Juliet Starrett. Those are two very close friends of mine. Yeah. And you got a very nice quote from doctor Kelly and Juliet for the book. That's fantastic. I only really connected with them about a year ago, but they've been some of the most I like I just have like, they've been so, so helpful. Like, what do you do when you wrote a book, and how do you get it out there, and how do you get people to read it? Like, they've given me so much of their time and help as they've just been they've been amazing. Yeah. They're fantastic. Alright. So doctor Wood, that's you, explains that a brain that improves with age is the result not of expensive pills, far off discoveries, or strict lifestyle optimizations, but rather of actions within our control, diet, sleep, physical activity, social connection, stress tolerance. Obviously, it goes on and on. But clearly, you have a lot of very practical specific advice that people can implement. And what else makes this book different? So I think those things that I mentioned make it different. I think it's very practical and approachable, but very science driven. And if people wanna, like, dig into the references, those are available. And then I think, like, towards the end, right, after I've given you like, there's all these different areas where we talked about nutrition, sleep, physical exercise. I give, like, how you would approach each of those things in terms of supporting cognitive function and minimizing dementia risk. But then I kind of bring them together in a model of how I think people can implement this in our daily lives. Like, how do I just pick one thing? And actually, does picking just one thing help to support, like, the overall function of the brain? And the answer is, yes. It does. Because when you sleep better, so say if you focus on improving sleep, you're more sociable. You're more likely to engage in cognitively challenging tasks. Your blood sugar improves. Your blood pressure improves. So just changing one area, suddenly the whole network shifts in your favor. And that's the case from almost anywhere you where you kind of approach it. And I think that means that people are much more likely to actually start doing this stuff and realize that it doesn't require a ton of work to start moving the needle. And then these things, you know, sort of compound over time. Alright. The stimulated mind. Folks, go grab a copy. Obviously you know, I hate when people say obviously, but I'm gonna say it. Obviously, doctor Tommy would has the credentials, has the expertise, has the bonafides with respect to research in humans, and has provided a lot that you can use in this conversation, and a lot more is in the Stimulated Minds. So check it out. Why on earth is your ex account called doctor Ragnar? Oh, I first started blogging around the time you first started podcasting. I remember listening to your, like, first interviews with Don D'Agostino back in the day when I was, like, in my in my PhD chair kind of in writing blog posts. But my middle name is Ragnar. So, like, I I created a website. It was doctor Ragnar. That was initially where I did my stuff. So let me think about this for a second. I'm gonna make myself probably regret asking this question. But what is Ragnar does Ragnar mean anything? Because now I'm thinking of Ragnarok and if those two have any connection. Is does it mean anything in particular? No. So you're right. Ragnarok is like the final battle of for Valhalla. And, actually, there are, like, some online gaming accounts where I use the name Ragnarok. But no. I think what it means, the translation for the old Norse is like wise counselor. I think that was another reason why I picked it because it was very self important as a as a 30 year old, health blogger. But it was my grandfather's name, and then these names sort of get passed down in the family. Technically, it should've because I was the firstborn grandson. It should've been my first name, but my dad was English, and it was like, people are just gonna make fun of him at school. He's gonna get everybody if he's called Ragnar. It's very cool now, right, because of Vikings and, like, all these other TV shows where Ragnar now appears. I mean, you could make it work, but doctor Ragnar Wood also is a little has this kind of a strange combo Yeah. Yeah. One, two to it. Yeah. Alright. Got it. At doctor ragnar, r a g n a r on x for people who wanna check it out. To be honest, I don't use x. So you can follow me on x, but you won't see anything. But people can find presumably, there's something at doctortommywood.com, drtommywood.com. Yeah. So that is the that's the home base online. Instagram. Instagram? At doctor tommy wood. Again, doctor tommy wood. At doctor tommy wood. Alright, folks. So you got it. Check out The Stimulated Mind. I'm a huge fan of what you do. I am going to try to improve my chesticle and arm situation with more use of BFR and Vans. And is there anything else you would like to say before we wind this to a close? Anything you'd like to ask of the audience, point them to, requests, complaints, anything that comes to mind? No. Other than, you know, if you do happen to pick a copy of the book and you do have any complaints, do send them to me. One of the reasons why I wanted to make it so that, like, every statement that I have in the book has a citation. You can go. You can read that paper. If you disagree with my interpretation of it, I want to know. Like, I can't promise that I have all the answers. So that will help me, learn more. So, yeah, if you have a complaint, just, tell me about it. Alright, Tommy. I really appreciate all the time, man. This was great. Took tons of notes for myself, which is always a good sign. So thanks for carving out a bit of time to be on the show. Really appreciate it. Thanks so much for having me. This is, so much fun. And for everybody listening, as per usual, we'll provide copious links and show notes at tim.blog/podcast, tim.blog/podcast. And until next time, be just a bit kinder than is necessary to others and also to yourself. As Jack Kornfield says, if your compassion does not include yourself, it is incomplete. Thanks for tuning in. Hey, guys. This is Tim again. Just one more thing before you take off, and that is five bullet Friday. Would you enjoy getting a short email from me every Friday that provides a little fun before the weekend? Between one and a half and 2,000,000 people subscribe to my free newsletter, my super short newsletter called Five Bold Friday. Easy to sign up, easy to cancel. It is basically a half page that I send out every Friday to share the coolest things I've found or discovered or have started exploring over that week. It's kinda like my diary of cool things. It often includes articles I'm reading, books I'm reading, albums perhaps, gadgets, gizmos, all sorts of tech tricks and so on that get sent to me by my friends, including a lot of podcast guests. And these strange esoteric things end up in my field, and then I test them, and then I share them with you. So if that sounds fun, again, it's very short, a little tiny bite of goodness before you head off for the weekend, something to think about. If you'd like to try it out, just go to tim.blog/friday. Type that into your browser, tim.blog/friday. Drop in your email, and you'll get the very next one. Thanks for listening. Folks, tax season is upon us. Fun, fun, fun. It always has a way of forcing us to look at our finances whether we want to or not. And if you're dreading that moment, it's a lot to pull together. There are ways to make your finances easier and far less stressful. Today's sponsor Monarch is the all in one personal finance tool. It's used by a bunch of my friends. It's used by my employees. It's designed to help make your life easier. It brings your entire financial life together in one dashboard on your phone or laptop. One person on my team has tried four other budgeting apps, said linking everything together at Monarch was by far easiest. Another said, to be honest, I'm quoting directly here, to be honest, the widgets are the most helpful thing for me because I can see shopping, food, and big expenses all on my screen without having to open the app. And then she gives the reason. I often forget about things like car payments are happening and now I know not to go overboard at Target or something like that. Right? So it makes it visible, easy to grasp. And in their 2025 survey, eight out of 10 members said Monarch helps them feel more in control of their finances. Monarch has helped users save more than $200 per month on average. You can also share your Monarch account with a partner or financial advisor at no extra charge and seven out of 10 numbers say it's improved financial conversations in their relationship. This is true for my employees as well as couples being on the same page. So, set yourself up for financial success in 2026 with Monarch. Check it out. Use code Tim at monarch.com for half off of your first year. That's 50% off your first year at monarch.com with code Tim. What many of you may not know is that I actually run two private invite only communities for some of my projects. The No Book, which eventually will come out after God knows how long, and Coyote, the card game. And the feedback from those groups has been absolutely invaluable. Moreover, perhaps most important, the connections that members have made and the interactions have been just a joy to behold. It's been so much fun. And I generally view communities as headache after headache after headache, way back in the day with like v bulletin and whatever and not to slam those guys. But man oh man, running communities can be a pain in the ass. And in this case, it's been easy. Why? Well, both of them are built on Circle, this episode sponsor. And before committing to using Circle, I did so much homework. I asked you all on social media, talked to dozens of creators, pressure tested alternatives, talked to all sorts of people on the phone, and Circle is where I landed. Circle quietly backs some of the most popular communities online run by folks like Kevin Rose, my buddy, Doctor. Becky from Good Inside, Ali Abdaal, Jay Shetty, Pat Flynn, and many others, including some giants I can't mention here. But it doesn't need to be giant. My two communities are maybe a hundred, hundred and fifty people a piece. They're not gigantic. If you run an online community, a membership, or a course business, Circle makes it easy to build a professional home for your audience. Events, courses, payments, custom branded apps, all in one place. And also, once I had my first one set up for the notebook, to spin up another one for Coyote, the card game, it took minutes. It was so, so fast. And as you might have noticed, things are getting pretty squirrely out there on the Internet. We're moving from content businesses to connection businesses. People want connection. They wanna know you're real. They want accountability, real progress, and communities are the most effective way that I have found to make that happen. So check it out. Go to circle.so/tim to get $1,000 off Circle Plus, exclusively for you guys listeners for a limited time. Check it out. You can also look at other options at circle.so/tim.