Neuroscientist Warns: These Daily Habits Are Raising Your Dementia Risk
Neuroscientist Dr. Tommy Wood argues that roughly 45% of dementia cases are preventable through lifestyle modifications, contrary to the long-held belief that cognitive decline is inevitable with age. Rather than focusing on supplements, the episode emphasizes a practical 3S framework—stimulus (learning, social engagement), supply (nutrition, cardiovascular health), and support (sleep, recovery)—as the foundation for lifelong brain health, with exercise, cognitive challenge, and proper nutrition being far more impactful than any pill.
Key takeaways
- • Approximately 45% of dementias are potentially preventable according to the Lancet Commission, and cognitive decline is not an inevitable part of aging; the brain remains plastic and capable of change even in people in their 60s, 70s, and 80s.
- • The primary driver of brain health is how you use your brain—focused learning, skill development, and social interaction matter far more than supplements, but engagement must challenge you enough to produce occasional errors, which trigger neuroplasticity.
- • Metabolic health markers like waist circumference, blood pressure, triglycerides, and blood sugar are direct dementia risk factors; chronic overeating, particularly of ultra-processed foods, physically shrinks the brain, while chronic underfueling also impairs cognitive function.
- • A balanced exercise approach combining aerobic work, resistance training, high-intensity intervals, and complex coordinative movement (like dancing, martial arts, or team sports) provides the most comprehensive brain benefits by targeting different brain structures and cognitive functions.
- • Whole foods trump supplements for brain health—sardines and blueberries exemplify nutrient-dense options—though vegans should specifically monitor omega-3 status, B vitamin levels (particularly homocysteine), and protein intake, which can be measured via testing.
- • Sleep is critical for cementing synapses and refining skill learning; chronic stress, smoking, and air pollution actively inhibit adaptation, so removing these obstacles matters as much as adding healthy behaviors.
- • Cognitive stimulus in retirement is crucial because loss of work-related learning and social engagement is a major driver of post-retirement cognitive decline, making continued skill-building and community engagement essential.
Recommendations (10)
"a safe recommendation is often to think about um a magnesium supplement especially if you're if you're an athlete um so and that particularly for people who struggle with sleep there's increasing e..."
Tommy Wood · ▶ 1:46:05
"My two favorite sort of brain health foods are sardines and blueberries"
Tommy Wood · ▶ 1:16:56
"something that gives you 1 to four grams of total DHA and EPA a day is probably good enough"
Tommy Wood · ▶ 1:24:21
"you can measure your omega-3 status. So omega three index at least above six, ideally above eight"
Tommy Wood · ▶ 1:18:47
"supplementing with vitamin D if you need. So vitamin D. Um you definitely don't want to be deficient, which is less than 20 less than 20 nanogs per mill. Um but you ideally you're at least above 30..."
Tommy Wood · ▶ 1:42:24
"if homoyine is elevated then those B vitamins I mentioned earlier the the ones that they usually um give in in clinical trials is uh B12 and folate. Um but you might also add B6 and riop and rioplavin"
Tommy Wood · ▶ 1:43:47
"creatine is the only supplement outside of those vitamins and minerals that I mentioned that I actually mentioned in my book. So I take 10 grams every day"
Tommy Wood · ▶ 1:47:48
Mentioned (6)
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