Podbit · Huberman Lab
Natural experiments in Wales, Australia, and Canada — where eligibility switched based on birth date — consistently showed lower dementia rates among shingles vaccine recipients. The newer Shingrix vaccine appears more protective than the older Zostavax. The leading hypothesis is an immunomodulatory effect that may also suppress other neurotropic herpesviruses.
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At 2:09:24 · chapter starts 2:03:37
Wood frames dementia not as a sudden disease but as the end stage of a long trajectory of decline that in principle could be interrupted much earlier — the way diabetes prevention should start well before diagnosis. Alzheimer's accounts for 60–80% of cases and overlaps substantially with vascular dementia (most Alzheimer's patients also have cerebrovascular pathology). The rare monogenic forms of Alzheimer's — presenilin 1, presenilin 2, APP mutations — account for less than 5% and possibly as little as 1% of cases. Late-onset Alzheimer's has a genetic component (APOE being the dominant risk gene), but lifestyle and environment are the primary drivers. The Lancet Commission's 14 modifiable risk factors include: early life education, hypertension, diabetes, hearing loss, vision loss, brain trauma, high LDL, physical inactivity, social isolation, depression, smoking, excessive alcohol, air pollution, and obesity. Together they account for ~45% of cases; sleep deprivation and nutrient deficiencies were notably omitted by the Commission despite evidence Wood argues is comparably strong. Some analyses suggest 70% of dementia may be preventable if socioeconomic and environmental factors are included.
The Lancet Commission on Dementia Prevention identified 14 modifiable risk factors that together account for approximately 45% of dementia cases — and some analyses suggest the figure could be as high as 70%.
Data on sleep and dementia risk consistently show that the threshold for elevated risk is approximately 6 hours of nightly sleep — those consistently below this level face significantly increased dementia risk.
Natural experiments in Wales, Australia, and Canada consistently showed that people who received the shingles vaccine had a significantly lower risk of dementia compared to those who did not.
Self-help fails because people are sold one universal cure by the hyper-responders who had a transformative result from it. The real problem is context: every method works for the right person at the right time, which is almost never you just because the author says so.
Spencer Greenberg was once so socially anxious his heart pounded just approaching a stranger. His therapist gave him homework: go to a bar alone, talk to 5 strangers. Starting with asking for the time, he worked up to asking men for hugs — and his anxiety fell dramatically in 6 months.
A person who flies regularly but obsessively checks weather forecasts before every flight is not doing exposure therapy — they're teaching their brain that flying is only safe with the ritual. Safety behaviors prevent the brain from ever learning that the feared thing is actually fine.
The worry-time technique assigns all worries to one scheduled slot (e.g. 5 PM). Every time a worry surfaces, you write it down and ban yourself from engaging with it until that time. When 5 PM arrives, most worries feel trivial and the act of batch-worrying exposes how little it actually accomplishes.
In a randomized study of 20 habit techniques, 'habit reflection' stood out: recall a past habit you successfully built, write down what helped you succeed, then apply those same strategies to your new habit. It works because it's self-adapting — it uses whatever worked for YOU.
The tiny habits technique — always having a minimal version of your habit you can do when life gets in the way — keeps the mental machinery of habit formation from breaking. Paradoxically, people given a tiny-habit fallback option were MORE successful at the full habit, not less.
Fears and worries act like playground bullies — they want to ambush you. But when you deliberately seek them out and choose the time of engagement, they lose their power. The volitional act of starting the fight on your own terms is one of CBT's most underappreciated insights.
Most downtime defaults are things you regret immediately after — phone scrolling, binge TV. 'Glad you did it' activities meet the same need for rest but leave you feeling like you spent your time well. The switch from a bad screen to a documentary, a book, or a walk costs almost no extra effort but compounds into identity over time.
You rarely control your first reactive thought. But you can train your second thought — the response to the trigger — by asking whether your initial reaction is the most helpful one and replacing it with something equally true but more constructive. Over time, that second thought becomes automatic.
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