David Sinclair on How Fasting Can Help Fight Against Aging

Episode Summary

Main Topics Discussed

• The benefits of intermittent fasting, particularly extended periods without eating, versus frequent small meals for health and longevity.
• The evolutionary basis for why human bodies respond positively to periods of scarcity and adversity.
• The activation of "longevity genes" or "adversity hormesis response genes" through fasting to fight aging and disease.
• The role of the molecule NAD (Nicotinamide Adenine Dinucleotide) in cellular energy production and its decline with age.
• Research into molecules like NMN (Nicotinamide Mononucleotide) that can mimic the effects of fasting and boost NAD levels, potentially serving as an "exercising in a pill."
• Personal experiences and practical advice on integrating fasting into daily life for improved mental acuity and physical performance.

Key Insights & Memorable Moments

• David Sinclair explains that our bodies evolved to respond to adversity; constant satiety (always being fed) signals to the body that survival is not a concern, thereby *deactivating* mechanisms that promote long-term survival and resilience against disease.
• Fasting activates specific "longevity genes" that help the body fight aging and various illnesses, leading to greater resilience.
• Both Joe Rogan and David Sinclair highlight that fasting can lead to equal or even better mental acuity, debunking the myth that one needs to be constantly fed to think clearly.
• Joe Rogan shares a personal anecdote about improving his comedy show performance by fasting before gigs, a practice he adopted after hearing comedian Kat Williams advocate for it.
• The discussion on NMN reveals remarkable findings in mice, where old mice given NMN for three weeks were able to run 50% further on a treadmill, demonstrating better blood flow, oxygenation, and energy, essentially an "exercising a pill" effect.
• A striking revelation is that NAD levels drop significantly with age, with a 50-year-old having roughly half the NAD levels they had at 20, which is crucial since NAD is vital for life.

Notable Quotes or Revelations

• "Our bodies were designed well or evolved to respond to adversity... we need adversity to be resilient and to fight disease."
• "It's very clear that people who are fasting have as good if not better mental acuity."
• "If you always are satiated fed your body says hey i've just killed an you know a mammoth no problem don't need to worry about survival i'm just going to go forth and multiply and screw my long-term survival."
• Regarding NMN in mice: "those mice could run 50 further... they had better blood flow better oxygenation better energy and that is literally exercising a pill."
• "When you're 50 you've got half the levels of this NAD that you did then you did when you're 20."

Overall Themes

The overarching themes revolve around longevity, resilience, and evolutionary biology's impact on modern health. The conversation strongly advocates for leveraging ancient biological responses, such as those triggered by intermittent fasting, to combat aging and disease in contemporary life. It bridges the gap between lifestyle choices and cutting-edge molecular science, suggesting that both behavioral changes (fasting) and future pharmaceutical interventions (like NMN) hold promise for extending human healthspan and performance.