Rich Roll · Video summary

Neuroscientist Warns: These Daily Habits Are Raising Your Dementia Risk

Neuroscientist Dr. Tommy Wood explains that 45-70% of dementias are preventable through lifestyle changes, emphasizing the 3S model (Stimulus, Supply, Support) for brain health.

Rich Roll · March 23, 2026 · 135-min episode · 8-min read

Neuroscientist Warns: These Daily Habits Are Raising Your Dementia Risk

Key takeaways

🎯A significant portion of dementias, estimated between 45% and 70%, are preventable by modifying lifestyle risk factors.02:38
🔍Modern life often leads to overstimulation from passive activities (like social media) and understimulation from truly engaging, deep learning or skill development.13:41
💡Brain health follows a 3S model: Stimulus, Supply, and Support. Stimulus involves engaging activities, Supply ensures necessary nutrients and energy, and Support includes rest and recovery.14:45
🚀Cognitive decline is not inevitable; the brain remains neuroplastic throughout life, capable of change and improvement with targeted stimuli and support.30:17
⚖️The placebo effect is powerful in health; believing a habit or supplement will help can genuinely improve outcomes, highlighting the importance of mindset.31:45
🧘Self-compassion is crucial for long-term health and performance; treating yourself with kindness, especially after setbacks, fosters resilience and better outcomes.34:51

Chapters

0:00🧠 Introduction to Dementia Prevention
1:40📊 Lancet Commission on Dementia Prevention
3:14❤️ Cardiovascular Health and Dementia
6:28📈 Dementia Statistics and Trends
10:45🍎 Modifiable Risk Factors for Dementia
14:45🏋️ The 3S Model: Stimulus, Supply, Support
17:30🔄 Interconnectedness of Health Factors
21:31📱 Technology's Impact on Brain Health
25:54💡 Cognitive Orthotics vs. Prosthetics
28:31🧠✨ Neuroplasticity Throughout Life
39:23🏃 The Importance of Movement for Brain Health
44:16💪 Resistance Training and Brain Health
1:01:04🥗 Nutrition Pillars: Nutrients, Energy, Pattern
1:01:30⚖️ Energy Availability and Brain Health
1:06:22🐟 Whole Foods vs. Supplements
1:08:57🍽️ Sustainable Eating Patterns
1:31:45💭 Mindset and Health Outcomes
1:34:51🤝 Self-Compassion and Resilience
1:41:20🔬 Supplement Truths: Vitamins, Minerals, Creatine
1:51:48😴 The Crucial Role of Sleep
1:57:00⌚ Orthosomnia and Wearable Data
2:02:28✈️ Managing Jet Lag and Recovery
2:05:49🌱 It's Never Too Late to Change Trajectory
2:12:38🌟 Empowering Action for Brain Health

The digest

This discussion with Dr. Tommy Wood, a UK-trained physician focused on brain health, reveals that a significant portion of dementia cases, potentially 45% or more, are preventable through modifiable lifestyle factors. The conversation emphasizes that cognitive decline is not an inevitable outcome of aging and that adopting a proactive approach to brain health is crucial. It offers a comprehensive framework for understanding and improving brain function throughout life, targeting both physical and mental well-being.