Performance Brain Health Part 2 with Dr. Tommy Wood, Doug Larson, Travis Mash & Dr. Mike Lane #839

14 snips

Mar 11, 2026

Dr. Tommy Wood, physician-scientist and author focused on brain health and performance, returns to unpack why oral health, sensory loss, and sleep shape long-term cognition. He discusses gum bacteria links to vascular and dementia risk. They explore how hearing, vision, and social input protect the brain. Sleep advice centers on opportunity, regularity, and avoiding behaviors that wreck architecture.

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ADVICE

Prioritise Sleep Opportunity And Regularity

Do prioritise regular sleep opportunity and consistency over obsessing about exact sleep stage numbers.
Tommy Wood advises most people need six to ten hours, with under six hours consistently linked to higher dementia risk.

INSIGHT

REM And Deep Sleep Work Together To Consolidate Learning

Sleep stages serve distinct roles: REM for emotional processing and deep sleep for replaying learned motor patterns and synaptic strengthening.
Tommy Wood explains deep sleep reactivates learning circuits and REM then optimizes those synapses, while glymphatic clearance occurs during sleep.

ADVICE

Use Wearables For Trends Not Exact Sleep Stages

Avoid trusting wearable sleep stage numbers absolutely; use them for long-term trends not single-night judgments.
Tommy Wood notes wearables misestimate deep sleep (±~1 hour) but can show consistent within-person trends using heart-rate proxies.

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In this episode, Dr. Tommy Wood returns to Barbell Shrugged for part two of a deep conversation on brain health, cognitive decline, and the daily habits that shape long-term mental performance. Joined by Doug Larson, Travis Mash, and Dr. Mike Lane, Tommy unpacks why oral health matters far more than most people realize, explaining how gum disease, oral bacteria, and chronic inflammation may contribute not only to cardiovascular disease but also to dementia risk. The crew also digs into the importance of sensory input, from hearing and vision to social interaction, and how losing those inputs over time can quietly accelerate cognitive decline.

The conversation then shifts into sleep, where Tommy breaks down what actually matters most for protecting the brain. Rather than obsessing over perfect sleep scores or chasing an arbitrary eight-hour target, he argues that the biggest levers are sleep opportunity, regularity, and avoiding behaviors that wreck sleep architecture. The group explores the different roles of REM and deep sleep, how sleep supports emotional processing, learning, and metabolic cleanup in the brain, and why wearables can be useful for trends without being trusted too literally. They also cover naps, alcohol, caffeine, common sleep aids, magnesium, chamomile, and why worrying too much about sleep can itself become part of the problem.

Finally, the episode broadens into brain risk and brain resilience in the modern world. Tommy highlights major risk factors for cognitive decline including hearing loss, high blood pressure, diabetes, smoking, obesity, alcohol, air pollution, and toxic exposures like lead and other environmental contaminants. He also gives a nuanced take on technology, arguing that video games, digital tools, and even AI can be either brain-supportive or brain-eroding depending on how they are used. When technology expands your capabilities, it can sharpen cognition. When it replaces thinking entirely, it can weaken the very skills you are trying to preserve. This episode is a practical roadmap for anyone who wants to think more clearly, age better, and protect their brain with smarter everyday decisions.

Links:

Doug Larson on Instagram Coach Travis Mash on Instagram