Overview

In this episode of The Joe Rogan Experience, neuroscientist and athletic performance coach Dr. Tommy Wood presents a compelling case that dementia is largely preventable through lifestyle choices, challenging the fatalistic view that cognitive decline is an inevitable part of aging. Wood argues that the brain, like any other tissue in the body, requires specific types of stimulation to maintain function and build capacity—and that modern life paradoxically delivers overwhelming amounts of passive input while starving us of the active, challenging engagement the brain needs to thrive. The conversation ranges from the neurobiology of Alzheimer's disease to the performance optimization strategies used with Formula One drivers, all tied together by Wood's central thesis: future-proofing your brain is not about avoiding decline, but about actively building cognitive headroom through deliberate, uncomfortable learning.

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0:35The Preventable Nature of Dementia

Wood opens by explaining his motivation for writing "The Stimulated Mind," drawing on his diverse experience treating newborn brain injury, traumatic brain injuries and concussions, studying long-term cognitive decline, and working with elite Formula One drivers. Across these domains, he identified core requirements the brain needs for development and maintenance of cognitive function—things people can apply daily to improve focus and well-being now while reducing dementia risk long-term.

Dementia, Wood clarifies, is the clinical diagnosis of losing enough cognitive function that you cannot care for yourself day-to-day. Alzheimer's disease accounts for 60-80% of cases, vascular dementia for 10-20%, with other types like frontotemporal and Lewy body dementia making up the remainder. Crucially, 70-90% of the first two types are directly tied to lifestyle and environment. Current estimates suggest 45% to potentially over 70% of dementias are preventable.

Wood distinguishes between early-onset Alzheimer's (caused by a single gene mutation, affecting people in their 30s-50s, representing about 1% of cases) and the age-related form most people think of, which is much more tied to environmental factors. The genetic component people often hear about is ApoE4—apolipoprotein E. Having one copy increases Alzheimer's risk by 2-6 times; two copies increases it 6-20 times. But Wood emphasizes that ApoE4 is a "risk multiplier," not a guarantee. It amplifies the effects of poor lifestyle factors like excessive alcohol, physical inactivity, and low-quality diet. The flip side: if you address those risk factors, you get greater benefit because you're offsetting that additional genetic risk. Family history also matters, but much of that comes from shared environment and lifestyle—you eat, sleep, and move like your parents did.

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5:54The Overstimulated, Under-Stimulated Brain

Wood introduces the provocative thesis behind his book's title: in the modern world, we are simultaneously overstimulated and under-stimulated. We receive massive amounts of input—scrolling, notifications, passive content consumption—but we're not doing calculations, formulating new ideas, being creative, or problem-solving. We're "just being inundated with nonsense."

The function of any tissue in the body—muscles, bones, liver, immune system—depends on the stimulus applied to it. The brain is exactly the same. If you want neural networks to perform well, you need to challenge them to enhance their capacity. Rogan draws the parallel to muscle atrophy and bone weakening without load, and Wood confirms this is the core idea.

Rogan raises the concern about people today, particularly with AI tools like ChatGPT being used to solve all their problems without thinking. Wood references an MIT study where students wrote essays using either just their own knowledge, Google, or an LLM. As outside support increased, there was less activity in brain networks associated with actually doing the task, and students remembered less afterwards. However, the study also found a productive use case: students who wrote an essay first, then used ChatGPT to ask "what did I miss?" produced better final output. Wood frames this as using AI as an "orthotic"—something that expands your capacities rather than replacing them—but only if you fully engage your brain first.

Rogan notes that social media leverages our biology as social beings. Wood explains the PRIME acronym: we prioritize information that is Prestigious, In-group, Moral, and Emotional—especially in social contexts, because we're trying to learn about our social environment to survive and be fitter. Social media exploits this desire for social information and connection while actually delivering isolation, with no real-time feedback from another human being. Rogan adds that you can say horrible things in a comment or text without thinking about it because there's no person in front of you.

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14:59Building Cognitive Headroom Through Deliberate Challenge

The core strategy for future-proofing your brain, Wood argues, is to think about new, challenging, and often creative skills. There's strong evidence for creative arts and music—they improve the function of brain networks at risk during aging, particularly those important for attention and social connection. Investing time in things you're bad at and getting better at them maintains the broad cognitive skills you'll need regardless of what the future holds.

Wood introduces the concept of "headroom"—the difference between what you need day-to-day and what you're truly capable of. He uses the analogy of leg strength: your daily need might be getting up off the toilet, but your maximum capacity is your max back squat. The gap between them is headroom, and it gives you capacity to perform when you're injured, sick, or under extreme stress. "We are going to be stressed, sleep deprived, sick, and we still want our brains to function," Wood says. Investing in really challenging tasks builds that capacity so it's available when needed.

Rogan observes that learning a new skill—sucking at something—is one of the best things you can do, but many people avoid it because their ego can't handle the frustration. Wood explains that the process of learning is driven by failure and making mistakes. The brain is a prediction machine, constantly predicting what will happen next. When you try something new and there's a gap between expectation and reality, that frustration diverts resources in the brain to close the gap—and that's what drives neuroplasticity.

On the question of how many new skills to take on at once, Wood recommends a broad base of talents (citing David Epstein's book "Range") but notes that developing some level of expertise is probably required for maximum benefit. The learning curve is steepest at the beginning, but expertise brings additional advantages. His advice: pick one or two things you're excited to continue getting better at for a long period of time. Across different skills, the core effects on the brain are similar, so choose what you enjoy most.

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25:56The Myth of Inevitable Cognitive Decline

Wood challenges the assumption that cognitive decline is a normal part of aging. The typical graph shows cognitive function—like processing speed—peaking in the mid-20s to early-30s, then declining. But Wood and his colleague Josh Turknett, a neurologist, published a paper theorizing that this population-level decline happens because people go to work, do the same thing repeatedly, and never invest in building cognitive capacities the way they did as children and students. "The decline is partly because we just stop doing that," Wood argues.

One theory of aging is that it's a continuation of developmental processes—the brain refining connections based on environment and stimulus. If you remove stimuli by no longer engaging in cognitively challenging things, the brain starts removing connections it doesn't think it needs. Studies show that people with very stimulating jobs—complex problem-solving, lots of social interactions—have slower rates of cognitive decline and lower dementia risk. Similarly, individuals who continue reading, writing, attending lectures, dancing, and pursuing hobbies show slowed decline.

Rogan draws the parallel to physical fitness, noting that at 58, his physical capacity is similar to what it was in his 30s because he forces it. Wood agrees: "Use it or lose it." He then cites the Seattle Longitudinal Study, run by Warner Schaie, which measured cognitive function in the same people every seven years for decades. They found that more than 50% of people maintain the same level of cognitive function into their 50s, 60s, 70s, and 80s. These data were actually used to raise the US retirement age in the 1980s because they showed decline wasn't normal. But the cultural belief that decline is inevitable has become a self-fulfilling prophecy—people stop engaging in challenging activities because they think they're "too old," and decline happens as a result.

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29:43ADHD, Physical Activity, and the Behavior Change Problem

Rogan raises the question of ADHD, suggesting it might be a superpower rather than a disorder—a trait that would have been valuable for persistent hunters who needed to keep tracking animals despite fatigue. Wood acknowledges the complexity: some individuals with ADHD genuinely benefit from medication, and stimulants paradoxically calm them down. But he also notes that the modern environment—bright light at night, excessive caffeine and stimulants—is layered on top of whatever underlying biology exists.

Rogan asks how much of ADHD depends on physical activity, sharing that if he can't exercise, he becomes a "complete basket case." Wood expands this, citing exercise physiologist Iñigo San-Millán's observation that physical activity is so baked into human evolutionary development that we've had to invent exercise to prevent what happens when we don't move. Lack of movement is "a disease-causing, pro-aging situation."

Rogan questions why exercise isn't prescribed for children before medication, noting that you can't make money off exercise prescriptions. Wood agrees that all kids should get several hours of movement and physical activity daily, but points out that the systems we have make it difficult to implement. Creating systems that allow people to change behaviors and supporting them through that process is "really hard"—nobody has solved the behavior change problem.

Rogan pushes back, arguing that it's about personal responsibility and starting small—like Jelly Roll, who went from 500 pounds to 200 pounds by just walking and cutting sugar, without GLP-1 drugs. Wood acknowledges it's doable but notes that different people need different levels of support. Some people don't have safe places to walk, don't have kitchens to cook in, or are working three jobs. He advocates for both individual effort and societal changes: improving education about physical activity and cooking, making high-quality healthcare accessible, and changing the built environment to make movement easier.

Rogan proposes a government website where people input their stats and receive a personalized program with community support. Wood notes that successful behavior change programs incorporate self-determination theory: humans need autonomy (feeling in charge of their decisions), competence (knowing what to do), and relatedness (community support). The most successful weight loss trial, the BROAD study, involved group potlucks and activities—community was key. However, he cautions that accountability apps can backfire because people leave when they start slipping, not wanting their buddies to know.

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57:23Formula One: Optimizing Elite Performance

Wood describes his work with Formula One drivers through Hintsa Performance, founded by Finnish orthopedic surgeon Aki Hintsa, who worked with Haile Gebrselassie and two-time world champion Mika Häkkinen. Wood serves as head scientist for motorsport, covering everything from karting kids to F1 drivers. Each driver typically has a dedicated coach—a strength and conditioning specialist, physio, or nutritionist—who travels with them constantly.

For these elite performers, the stimulus part is already taken care of—they've been building driving skills for decades. The focus shifts to recovery and maintenance. Drivers are essentially jet-lagged nine months of the year, in a different country every week, with sponsor meetings and media obligations on top of racing. Wood's team focuses on maintaining performance throughout the season and maximizing recovery between races.

On jet lag mitigation, Wood explains the strategies: shifting light exposure, sleep timing, exercise, and caffeine timing to align with the destination a few days before travel. Food timing is also a "zeitgeber" (time-giver) that helps drive circadian rhythm. He recommends avoiding eating during flights and having the first meal at a normal time after landing. Rogan adds that he immediately goes to the gym after arriving—no negotiation—which Wood confirms is excellent for advancing circadian phase.

Regarding supplements, Wood notes that everything used with F1 drivers must be third-party tested (NSF for Sport or Informed Sport certified) because drivers are subject to WADA anti-doping regulations. He is cautious about peptides, noting the lack of high-quality human studies and the gray market contamination risks. The primary driver of performance, he explains, is arousal—getting to the sweet spot on the Yerkes-Dodson curve. Under-aroused means disengaged and lethargic; over-aroused means anxious and sweaty. The sweet spot enables flow states. Drivers achieve this through warmup sprints, music, bright light, breath work, cold exposure, and carefully calibrated caffeine use.

Wood emphasizes that the best predictor of performance across most sports is subjective well-being—how the athlete feels. "Am I tired? Am I achy? Do I feel alert?" These simple questions often predict performance better than blood tests or heart rate variability. The real challenge is creating an environment and framework that allows athletes to consistently nail the boring basics: sleep, nutrition, training, and recovery.

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1:40:44The Psychology of Elite Performance

Rogan raises the controversial topic of mental coaching in combat sports, sharing that a coach friend recently refused to work with fighters who need mental coaches, wanting "killers" who just go out and perform. Wood challenges this view, noting that the most resilient athletes across sports tend to be self-compassionate. This includes mindfulness, understanding their place in the world, and "common humanity"—treating themselves as they would treat others, acknowledging that everyone makes mistakes.

Wood cites Roger Federer's famous graduation address, where Federer noted that across his career he won only 54% of points—meaning 46% of points he lost. Every unforced error required him to come back and say, "I've got this. I know I can do this." Athletes who are successful for long periods tend to have these mental skills: the ability to think about the bigger picture, understand what they've overcome previously, and treat themselves more kindly.

Rogan connects this to professional pool, where elite players like Joshua Filler (Germany) and Chinese Taipei players show no emotion when missing a shot—they just sit down with a dead expression. American and European players who get visibly upset often see their performance "fall off a cliff" after a few bad shots. Wood explains this through the arousal curve: getting stressed and worked up pushes you further from the optimal performance zone, and dwelling on failure means you're thinking about the past rather than the next shot.

Wood discusses the "stress-is-enhancing" mindset, based on work by Alia Crum at Stanford. People trained to view stress responses as helpful—"this is me rising to the occasion"—still experience stress hormones but release other compounds that counteract negative effects and drive adaptation. This mindset predicts how well Navy SEALs perform during training. For in-the-moment regulation when you're too flooded with adrenaline to think clearly, Wood recommends bottom-up tools like breath work, closing your eyes, and visualization.

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2:06:15The 3S Model: Stimulus, Supply, Support

Wood outlines the framework at the heart of his book: the 3S model. The first S is Stimulus—the challenging, novel activities we've been discussing. The second S is Supply: when you stimulate a brain network, the neurons and astrocytes there demand more blood flow. Blood vessels must dilate to bring oxygen and metabolic substrates (glucose, ketones, lactate). This requires good cardiovascular health and metabolic health. High blood pressure and high blood sugar are two of the biggest risk factors for later dementia because they impair this supply component. Key nutrients in this bucket include omega-3s, vitamin D, iron, magnesium, and B vitamins—deficiencies in any increase dementia risk.

The third S is Support: adaptation and enhanced function occur during sleep and recovery. Hormonal status matters, as do trophic factors like brain-derived neurotrophic factor (BDNF), which supports neuroplasticity. Things that inhibit this process include chronic stress (creating an "overtraining picture" in the brain), smoking, excess alcohol, and air pollution.

The crucial insight is that these three components interact. Focusing on one area shifts the whole network. If you improve sleep, inflammation decreases, blood pressure and blood sugar improve, and you feel more sociable—making you more likely to engage in cognitively stimulating tasks. Studies show that brain training programs in older adults improve sleep, because stimulating a tissue drives greater need for recovery. More exercise also improves sleep. "It's not this long list of things that everybody has to do," Wood emphasizes. "If you give somebody a list of 37 things, they'll do zero things." Any entry point can start shifting things in your favor.

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Conclusion

What stays with the listener is Wood's reframing of cognitive aging from a passive decline to be feared into an active process to be managed. The episode's central message—that dementia is largely preventable, that cognitive decline is not inevitable, and that the brain responds to challenge at any age—is both hopeful and demanding. Wood's 3S model provides a practical framework, but the real takeaway is the call to embrace discomfort: learning new skills, being bad at things, and persisting through frustration. The conversation with Rogan moves seamlessly from the molecular biology of amyloid plaques to the psychology of elite athletes, grounded throughout in Wood's insistence on high-quality evidence and his refusal to oversimplify. The episode matters because it offers a path forward that doesn't depend on expensive technology or miracle drugs, but on the fundamental biological principle that what you use, you keep—and what you don't, you lose.

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Key takeaways

• 45-70% of dementias are preventable through lifestyle and environmental factors, even in people with genetic risk factors like ApoE4.
• The brain requires active, challenging stimulation—not passive input—to maintain function; modern life provides overstimulation of nonsense but under-stimulation of genuine cognitive work.
• Cognitive decline is not an inevitable part of aging; the Seattle Longitudinal Study found that over 50% of people maintain cognitive function into their 80s, and decline is often a self-fulfilling prophecy of disengagement.
• The 3S model (Stimulus, Supply, Support) provides a framework: challenge the brain with novel skills, ensure good cardiovascular and metabolic health to supply blood and nutrients, and prioritize sleep and recovery for adaptation.
• Learning new skills drives neuroplasticity through failure and prediction error—the frustration of being bad at something is exactly what the brain needs to rewire.
• For elite performers like Formula One drivers, the focus shifts from stimulus to recovery and consistency, with subjective well-being being the best predictor of performance.
• The most resilient athletes tend to be self-compassionate, not self-critical; they treat themselves as they would treat others and focus on process rather than outcome.
• Any entry point into the 3S model—better sleep, more exercise, learning a new skill—creates positive cascading effects across the entire system.