Fasting as a Path to Longevity: The Facts | Lifespan with Dr. David Sinclair - Season 2, Episode 2
In a Nutshell
Calorie restriction and time-restricted eating slow aging by 2-3% and cut mortality risk 10-15% by activating ancient survival pathways—mTOR, AMPK, and sirtuins—that trigger DNA repair, autophagy, and reduced inflammation. These effects have been replicated across yeast, worms, flies, mice, and primates, with rhesus monkey studies showing 30% calorie cuts delayed cancer, diabetes, and heart disease. Modern three-meal-plus-snack patterns clash with human evolution and ancestral feast-famine cycles, driving obesity and accelerated aging; eating less often, while preserving nutrients, is the most potent intervention available until drugs fully mimic these pathways.
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Calorie restriction puts the body in survival mode. A study showed that calorie restriction can slow down the rate of aging, translating into a 10-15% lower chance of mortality. Calorie-restricted mice lived about 28% longer. LCA, a bile acid in the gut, could mimic the anti-aging effects of calorie restriction. When researchers changed the microbiome of the mice, calorie restriction no longer worked.
Lifespan discusses cutting-edge science of aging and living healthier. David Sinclair is a scientist and professor working on understanding why we age and discovering ways to slow and reverse the aging process.
The team investigated food marketing and bad nutrition science. Much of the struggle to keep weight down is due to marketing dating back to the early 20th century. A 50,000-year-old Neanderthal toe bone fragment from a cave in Siberia may help explain why some people gain weight easily. The bone was held at a Harvard genetics department faculty meeting. Professor David Reich sequenced DNA from the bone, with his lab located down the hall from Sinclair's at Harvard.
The episode covers not just what to eat, but when to eat. When asked for one suggestion to live a long life, the answer is eat less often. The episode covers caloric restriction, new science about genes and small molecules that mimic caloric restriction, ancestral diets going back millions of years, why modern society and eating patterns are harmful, and how to determine what works for individual longevity.
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