Forever Health

Introduction

What if aging isn’t something that simply happens to you — but a disease with a known mechanism that can be slowed, and potentially reversed? That’s the premise at the heart of Dr. David Sinclair’s life work. Sinclair, Professor of Genetics at Harvard Medical School and co-director of the Paul F. Glenn Center for the Biology of Aging, laid out his Information Theory of Aging in a landmark Huberman Lab conversation — and explained what each of us can do, starting today, to alter our biological clock. The science is more actionable than most people realize.

What the Experts Are Saying

Dr. Sinclair opens with a provocative reframe: “Aging is 80 to 90% the cause of heart disease, Alzheimer’s. If we didn’t get old and our bodies stayed youthful, we would not get those diseases.” He argues that rather than treating the downstream manifestations of aging — the heart disease, the dementia — medicine should target the upstream cause. “If you turn the clock back in tissues, those diseases go away.”

Dr. Andrew Huberman asked Sinclair to name the core phenomenon driving cellular aging. Sinclair’s answer centers on the epigenome — the control system that determines which genes are switched on or off in each cell. “I boil aging down to an equation: the loss of information due to entropy.” He compares DNA to the music on a compact disc, and the epigenome to the reader. “Aging is the equivalent of scratching the CD so that you’re not playing the right songs, and cells, when they don’t hear the right songs, get messed up and don’t function well.”

The damage, Sinclair says, is measurable — and reversible. His Harvard lab demonstrated in animals that by restoring correct gene-expression patterns, aged cells can be coaxed back toward a younger state. In one landmark Nature paper, his team restored vision in aged blind mice by resetting the epigenetic clock in retinal neurons. Crucially, he is emphatic that “80% of our future longevity and health is controlled by the epigenetic information — the control systems. It’s not your genes.”

Dr. Mark Hyman, physician and bestselling author, has echoed the same call: targeting the root biology of aging rather than downstream disease is the most powerful and leveraged approach to long-term health. Dr. Rhonda Patrick of FoundMyFitness highlights that the sirtuins Sinclair studies are also central regulators of mitochondrial function, connecting the epigenomic aging story directly to cellular energy.

The Science Behind It

The epigenome operates through chemical tags — most notably methylation marks — placed on DNA to indicate which genes should be active in which cell types. A neuron and a skin cell contain the same DNA but read it differently because of these marks. Over time, the marks drift. “Genes that were once silent start coming on in the wrong place,” Sinclair explains. “Cells lose their identity — they forget what they’re supposed to do — and we get diseases.” The rate of this drift is captured by the Horvath epigenetic clock, a biological age test that predicts health outcomes more accurately than chronological age alone.

The primary drivers of epigenetic damage are DNA breaks from radiation, UV exposure, chronic stress, and persistent overnutrition — each accelerating the “scratching” of the epigenomic CD. The good news: a family of seven proteins called sirtuins act as molecular repair crews. They use NAD+ as fuel to survey and maintain the epigenome. Keeping sirtuins well-fueled and active is the central goal of Sinclair’s longevity protocol — and the target of every intervention he discusses.

Key Benefits of Protecting the Epigenome

• Biological age reversal is possible: Sinclair’s lab reversed epigenetic age in mouse retinal neurons, restoring vision in aged blind animals — and his group has documented significant biological age reductions in human subjects following multi-year intervention protocols.
• Disease prevention at the root cause: Heart disease, Alzheimer’s, cancer, and type 2 diabetes are downstream consequences of epigenetic drift. Addressing the upstream cause reduces risk across all of these simultaneously.
• Fasting activates your longevity genes: Periods of low insulin and low amino acids activate sirtuins and downregulate mTOR — the two most important longevity pathways, per Sinclair. Even a 16-hour daily fast can meaningfully shift this balance toward cellular repair.
• Resveratrol acts as a sirtuin accelerator: At 1,000 mg/day taken dissolved in olive oil or Greek yogurt (which raises bioavailability fivefold), resveratrol activates the sirtuin enzyme directly — though it requires adequate NAD+ fuel to be maximally effective.
• Metformin mimics caloric restriction: Metformin activates the AMPK pathway — the same one triggered by fasting — and epidemiological data links it to reduced rates of cancer, heart disease, and dementia; type 2 diabetics on metformin have been shown to outlive non-diabetics.
• Biological age is now measurable: Simple methylation-based tests (mouth swab or blood) can estimate biological age with meaningful accuracy, allowing you to track whether your interventions are actually working.

How to Get Started

Sinclair’s protocol, refined over 15 years of self-experimentation and regular blood tracking, centers on a few key pillars. He skips breakfast daily and eats within a roughly two-hour window in the evening — keeping insulin and mTOR low for most of the day. He eats mostly plants with occasional fish, avoids simple carbohydrates and sugar, and rarely eats red meat. Each morning he takes 1,000 mg of NMN dissolved in olive oil or yogurt alongside 1,000 mg of resveratrol (the fat is essential — it raises bioavailability fivefold), plus metformin on non-exercise days. He strongly emphasizes pulsing: taking some supplements every other day, exercising fasted, and giving the body alternating periods of adversity and nourishment. “I pulse things so that I get periods of fasting and then I eat, then I take a supplement, then I fast, then I exercise. It’s taken me 15 years to develop my protocol and there’s a lot of subtlety to it.”

What to Watch Out For

Sinclair is emphatic that what works for him may not be optimal for everyone — he measures 45 blood biomarkers regularly and adjusts accordingly. Metformin requires a prescription in the US and can cause GI side effects in roughly 20% of users; discuss with your physician. High-dose resveratrol may interact with blood thinners. Time-restricted eating is not appropriate for those with eating disorder history, or for pregnant, nursing, or very young individuals. The gene therapy approach to epigenetic reprogramming is still experimental and years from routine clinical use. Epigenetic age tests should be interpreted as directional, not definitive. As always, consult your doctor before changing medications, supplements, or fasting practices.

Watch the Full Expert Videos

Dr. Andrew Huberman & Dr. David Sinclair (Huberman Lab): The Biology of Slowing & Reversing Aging — Full Episode

Dr. Andrew Huberman & Dr. David Sinclair — Essentials (Huberman Lab): Essentials: The Biology of Slowing & Reversing Aging

Dr. Mark Hyman: The 3 Daily Supplements Everyone Should Be Taking For Longevity

Dr. Andrew Huberman & Dr. Peter Attia (Huberman Lab): Supplements for Longevity & Their Efficacy

Dr. Rhonda Patrick & Dr. David Sinclair (FoundMyFitness): The Theory of Aging, NAD+ Boosters, Sirtuins, and More