The Science Behind Why We Age | Lifespan with Dr. David Sinclair #1
In a Nutshell
Aging is a reversible epigenetic process of "ex-differentiation," where cells lose their identity due to disrupted DNA packaging, driving diseases like Alzheimer's, diabetes, and heart disease; it's controlled by conserved longevity genes (mTOR, AMPK, sirtuins) activated by hormesis from fasting, exercise, calorie restriction, and drugs like metformin and rapamycin. Long-lived species (naked mole-rats, bowhead whales, bristlecone pines) thrive in harsh environments by upregulating these genes, proving humans can engineer similar longevity—biological clocks now measure and reverse aging by years in humans via interventions like metformin + growth hormone + DHEA. Lifestyle (80% of control) trumps genetics; future episodes detail practical steps to slow/reverse aging for decades healthier life, treating aging as a treatable disease rather than whack-a-mole symptom management.
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Welcome to the Lifespan Podcast, where we discuss the science of aging, and how to be healthier at any stage of life. David Sinclair is a professor at Harvard Medical School running a research lab that studies aging, why we get old and why we may not have to. He's been there for 20 years, and they've made some breakthroughs to talk about on this podcast. Co-host is Matt LaPlante, a professor of journalism at Utah State University, the Harvard University of the Mountain West. They co-wrote a book called Lifespan together. The book has had great reception, but so much has changed in the last three years since publication.
Matt LaPlante was a reporter and war correspondent. They talk a lot every week while writing another book due out probably next year. Their conversations are funny, and people suggest they should be a podcast. Matt brings out the best in David by asking caveman-like questions that gave rise to Lifespan. Working with David feels like a graduate course for Matt, a lifelong learner.
Before meeting, Matt wrote a book about epigenetics and Superlative: The Biology of Extremes about animals that teach how to optimize biology. We're at a turning point in medical history where we understand how to control our biology, optimize our bodies during early life, mid-life, and late life to lead lives decades longer and healthier. David reads thousands of scientific papers with a team of researchers. They present trustworthy information beyond untrustworthy internet sources, citing original studies and specifying the organism (worm, yeast cell, mouse, or human). No supplements or products are being sold; discussions are fact-based.
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