How To Protect Your Brain Health and Avoid Burnout with Neuroscientist Dr. Tommy Wood

Neuroscientist, performance expert, and author of The Stimulated Mind, Dr. Tommy Wood has spent two decades translating brain science into practical habits. In his conversation with WHOOP Global Head of Human Performance and Principal Scientist Dr. Kristen Holmes, Dr. Wood explains that cognitive health is more trainable than most people think. He breaks down what cognitive health actually means, why cognitive decline is not a fixed destiny, and how to protect your brain with a simple framework built around stimulus, supply, and support.

What is cognitive health, and how much control do you really have over it?

Cognitive health is your ability to think clearly, learn, remember, pay attention, and make decisions. That includes memory, processing speed, and executive function — the brain skills that help you plan, prioritize, and resist distractions. Some of those abilities naturally change with age. Processing speed may slow. Working memory may get less sharp. But, that does not mean decline is the same for everyone, and we have more control than we think.  Just as important, not every mental skill moves in the wrong direction. As you age, you can gain more of what researchers call crystallized intelligence: pattern recognition, judgment, and the ability to see the bigger picture. Wisdom still counts.  Dr. Wood says that we should think about cognitive health less as a fixed curve and more as a trajectory you can influence. Your habits can raise your starting point, slow future losses, and build more buffer before impairment. “I want people to know that they have a huge amount of control over their cognitive future,” he says.

For Dr. Wood's full breakdown of which mental abilities decline, improve, or stay trainable with age, tune in to the full podcast episode.

What is the simplest framework for improving cognitive health?

Dr. Wood proposes the 3S model: Stimulus, Supply, Support.

Stimulus This is how often you ask your brain to adapt. Learning a language. Playing music. Doing complex work. Taking a dance class. Playing tennis. Having real conversations. Monotonous, low-control work is linked with worse long-term brain outcomes, but you can offset some of that by building cognitively demanding hobbies outside work. Supply Your brain needs blood flow, oxygen, energy, and nutrients. That means aerobic fitness, metabolic health, resistance training, and a nutrient-dense diet. Think omega-3 fats, berries and other polyphenol-rich foods, B vitamins, minerals, and enough total energy to support recovery. Support This is where adaptation happens. Sleep, recovery, and stress regulation all sit here. So do the obvious blockers: smoking, excess alcohol, untreated high blood pressure, poor sleep habits, and in some cases even high pollution exposure.

The useful part of the 3S model is that the buckets overlap. Exercise improves supply, but it also supports sleep. Learning a new skill creates stimulus, but it can also improve mood and social connection. Systems work better than isolated hacks.

If you want the full 3S framework straight from Dr. Wood, the podcast goes deeper on how to apply it without overcomplicating your week.

What is the minimum effective dose of movement for cognitive health?

Dr. Wood says that it’s less than most people think, but more than nothing. If you want to improve cognitive health, start by moving a little more than you do now. Start with steps Dr. Wood points to a surprisingly approachable floor: about 1,000 extra steps per day can move risk in the right direction if you're currently inactive. A walking meeting, stairs, or a short post-meal walk all count. Add a brisk walk Walking at a pace above your default is both a cardiovascular challenge and a mild cognitive one. Regular brisk walking has been linked with better memory-related brain outcomes, including support for the hippocampus, a region involved in learning and memory. Layer in resistance training About an hour per week of basic strength work has shown cognitive benefits in trials, including improvements in executive function and white matter. White matter is the brain's communication wiring. Keeping it healthier helps information move faster and more efficiently. Choose open-skill sports when you can Pickleball, tennis, dance, soccer, and other coordinative sports stack benefits. You get cardio, reaction time, motor learning, strategy, and often social connection in one session. That tends to beat exercise that is purely repetitive. The podcast includes Dr. Wood's full exercise hierarchy for brain health, plus why a walking meeting may be smarter than another hour in your chair.

Is stress bad for cognitive health?

Dr. Wood's answer: stress is not the villain. Unrecovered stress is. “Anytime we're exposed to any kind of stimulus, we activate a version of the stress response,” says Dr. Wood. That's true for learning, lifting, intense exercise, and focused work. The stress response is part of how the brain knows something matters. The problem is when you keep stacking demands and never give the brain time to adapt. Chronic stress can disrupt sleep architecture: the structure of deep sleep and REM sleep that supports recovery, emotional regulation, and memory consolidation. In other words, you don't build a better brain during the challenge itself. You adapt afterward.

This is the same idea WHOOP members see across training and recovery: stimulus first, adaptation second. Protecting your sleep window, limiting excess alcohol, and not turning every day into an all-out effort are brain-health habits, not just fitness habits. For the full stimulus-recovery discussion and why sleep is the adaptation phase for the brain, listen to the complete conversation.

What are the earliest signs of cognitive overload or burnout?

Your subjective signals often show up before a formal test does. Brain fog, irritability, worse sleep, lower motivation, mood shifts, appetite changes, and feeling mentally flat can all be early warnings that your load is too high and your support is too low. That matters because cognitive health is not only about dementia decades from now. It's also about how you function this week. Are you making more mistakes? Losing words? Feeling wired but unfocused? Those patterns deserve attention.

Your first move does not need to be complicated: reduce unnecessary load, protect sleep, keep moving, and simplify inputs for a few days. If changes are sudden, severe, or persistent - especially with headaches, major memory issues, or neurological symptoms - talk to a clinician.

If you like data, baseline cognitive testing can be useful too. It gives you something better than guesswork, especially when paired with trends in sleep, recovery, and day-to-day function.

Dr. Wood shares how to spot the difference between productive challenge and cognitive overload in the full podcast.

The bottom line

Your cognitive health is more trainable than you think. Here are the key takeaways from Dr. Wood's conversation:

• You have control over your cognitive future. Decline is not automatic or equally severe for everyone. Your habits can raise your baseline, slow future losses, and build cognitive reserve.
• Use the 3S framework: Stimulus, Supply, Support. Challenge your brain with learning and novelty. Fuel it with movement, metabolic health, and nutrient-dense food. Protect adaptation with sleep, recovery, and stress regulation.
• Movement matters at every dose. Start with 1,000 extra steps per day. Add brisk walking, an hour of strength training per week, and strategic intensity. Choose open-skill sports when possible.
• Stress isn't the problem. Unrecovered stress is. Your brain adapts during recovery, not during the challenge. Protect your sleep and don't turn every day into an all-out effort.
• Multitasking trains distractibility. Add deliberate focus practice through language study, music, reading, or any skill that requires sustained attention.
• Listen to your subjective signals. Brain fog, irritability, worse sleep, and lower motivation can be early warnings that your load is too high and your support is too low.

Listen to the full WHOOP Podcast episode with Dr. Tommy Wood, then audit your own week through the 3S lens. Where are you challenging your brain, fueling it, and giving it enough recovery to improve?