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Peter Attia MD#27 – David Sinclair, Ph.D.: Slowing aging – sirtuins, NAD, and the epigenetics of aging
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At a glance
WHAT IT’S REALLY ABOUT
David Sinclair on Sirtuins, NAD Precursors, Resveratrol and Epigenetic Aging
- Sinclair recounts his path from Australia to Lenny Guarente's MIT lab, where yeast genetics revealed that SIR2 silencing proteins are tied to aging through a role in DNA repair that distracts them from gene silencing.
- The conversation covers how NAD is required for sirtuin activity, why NAD levels fluctuate, and the mitochondrial oasis hypothesis showing mitochondrial NAD matters most for cell survival.
- Sinclair describes how resveratrol was found as a sirtuin activator and extended mouse lifespan on a Western diet in 2006, while later independent studies using regular food did not replicate the effect.
- He discusses NR and NMN supplements, open questions about tissue uptake and transport, his own use of resveratrol and metformin, and drug and fertility programs built on better NAD precursors.
- Sinclair presents his unpublished unifying theory that aging stems from loss of analog epigenetic information rather than damaged DNA, and argues that reversing it, and testing drugs in a roughly 5,000-person trial, is within reach.
IDEAS WORTH REMEMBERING
5 ideasSirtuins act as ancient stress-response proteins that multitask
Sinclair says sirtuins evolved to sense stress and help organisms hunker down, but DNA breaks pull them away from silencing genes, and this distraction is conserved in aging mammals.
NAD levels are dynamic and compartment-specific
Sinclair's lab found NAD changes with age, diet, and stress, and that mitochondrial NAD can matter more for survival than cytoplasmic NAD.
Resveratrol worked in mice on a high-fat diet but not in regular food studies
Sinclair's 2006 study showed benefits in overfed mice, while later NIA-run studies feeding it in regular food found no lifespan extension; he cites poor solubility and absorption without fat as a likely issue.
High doses can activate other pathways and complicate interpretation
Sinclair notes that high-dose resveratrol also activated AMP kinase, so his lab now uses the minimum effective dose, and high-dose nicotinamide inhibits sirtuins via feedback.
NMN and NR evidence in humans is still mostly anecdotal
Sinclair hears many stories of improved athletic performance but says without placebo controls he knows no more than Peter Attia, which is why human trials and tissue-level NAD measurements by MRS are being planned.
WORDS WORTH SAVING
5 quotesI've been interested in aging since I was four, since I realized that everybody and everything around me is gonna die.
— David Sinclair
They didn't evolve for longevity, they evolved for survival of during adversity.
— David Sinclair
I truly believe that if we can extend the lifespan of a yeast, a worm, and a, a mouse, humans are so close.
— David Sinclair
the compact disc of our lives is still intact when we're old, but it's as if we've got a scratched CD and the cells don't read the right genes at the right time anymore, and they lose their identity.
— David Sinclair
you have to be massively determined. You have to have grit. And I just wouldn't give up because there's nothing else I wanted to do in my life.
— David Sinclair
High quality AI-generated summary created from speaker-labeled transcript.
