Stimulus: Use It or Improve It

This episode is brought to you by Cozy Earth, BiOptimizers,  Maui Nui, and One Skin. 

We’ve been told that cognitive decline is just a normal part of aging. But what if the real story has less to do with age and more to do with how we’re living? Your brain is constantly adapting to the signals you give it, and those signals may matter far more than you think.

Today on The Dhru Purohit Show, Dhru sits down with neuroscientist and performance expert Dr. Tommy Wood to challenge the idea that cognitive decline is inevitable and reveal how our modern lifestyle may be quietly reshaping our brain health. Dr. Wood explains why dementia risk is often a mismatch problem, breaks down the Movement Funnel and the three types of exercise that stimulate different brain networks, and shares his “3 S’s” framework for building long-term resilience. He also unpacks the science behind high-intensity training, purpose and social connection, brain training, stress, creatine, and what truly separates superagers from everyone else.

Dr. Tommy Wood is an Associate Professor of Pediatrics and Neuroscience at the University of Washington, where his research focuses on brain health across the lifespan, from newborn brain injury to adult traumatic brain injury and long-term cognitive decline. He earned 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. He has consulted with elite athletes, including multiple Formula 1 drivers, and serves as Director and Treasurer of the British Society of Lifestyle Medicine and as Head of Research for the dementia-prevention charity Food for the Brain.

In this episode, Dhru and Dr. Wood dive into:

(2:03) Cognitive decline isn’t a brain issue; it’s a lifestyle mismatch

(10:18) The overlooked force that could matter more than any supplement.

(15:00) How modern life quietly reshaped our thinking about aging and mortality

(18:37) The evolutionary truth your body and brain still expect from you

(30:29) The landmark study that changed how scientists view dementia risk

(41:06) Why pushing your limits might sharpen your mind faster

(44:00) The framework that explains why your workouts may not be enough

(50:57) What early childhood movement reveals about lifelong brain resilience

(57:30) The three simple levers that could shift your brain’s trajectory

(1:18:06) Why brain games are not the full answer to cognitive longevity

(1:28:22) How purpose-driven communities seem to outperform biology

(1:35:57) The counterintuitive way to think about stress and long-term health

(1:41:28) The surprising compound that fuels both muscle and mind

(1:46:50) What truly separates superagers from everyone else

(1:53:03) The mindset shift that ties everything together

Also mentioned in this episode:

• The Stimulated Mind

• Brain HQ

• Creative Experiences and Brain Clocks Study

For more on Dr. Wood, follow him on X/Twitter, Instagram, LinkedIn, Apple Podcasts, or visit his Website.

This episode is brought to you by Cozy Earth, BiOptimizers, Maui Nui, and One Skin. 

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