David Sinclair's longevity protocol is built on three lifestyle pillars — daily intermittent fasting, brief cold exposure, and plant-forward eating — plus a personal stack of supplements (NMN, resveratrol, vitamin D3, K2) and, for him, metformin. Sinclair argues these habits activate longevity pathways like sirtuins and AMPK, slowing the biological aging clock. LYF+ tracks the lifestyle side of the protocol on iPhone.
Who is David Sinclair?
David Sinclair is a professor of genetics at Harvard Medical School and co-director of the Paul F. Glenn Center for Biology of Aging Research. His laboratory has published more than 200 peer-reviewed papers on the biology of aging, sirtuins, NAD+ metabolism, and reprogramming of old cells. He is also the author of the bestselling book Lifespan: Why We Age — and Why We Don't Have To, published in 2019, and the host of the Lifespan Podcast.
Unlike Bryan Johnson, whose Blueprint is a personal experiment documented in the open, Sinclair's recommendations are grounded in decades of published research on aging biology. That said, his specific supplement choices and doses are personal — Sinclair himself is careful to distinguish "what the science says about longevity pathways" from "what I personally take."
The three lifestyle pillars of the Sinclair protocol
Across his book, podcasts and interviews, Sinclair comes back to the same three lifestyle levers as the foundation of his own routine. None of them require a prescription.
| Lever | Sinclair's approach | Why it matters |
|---|---|---|
| Intermittent fasting | Skip breakfast, eat in a ~8 hour window | Activates sirtuins and AMPK pathways, lowers insulin |
| Cold exposure | Brief cold showers, occasional ice baths | Activates brown fat, boosts norepinephrine, supports mitochondrial biogenesis |
| Plant-forward eating | Reduced animal protein, lots of plants | Lowers mTOR signaling, tied to extended lifespan in animal studies |
Intermittent fasting: the foundation
In his public talks, Sinclair has repeatedly stated that if he could only keep one longevity habit, it would be time-restricted eating. He typically skips breakfast and consolidates his meals into the afternoon and evening, spending roughly 16 hours per day in a fasted state.
The biological rationale: when the body goes without food for an extended period, insulin drops, nutrient-sensing pathways like mTOR quiet down, and longevity pathways (sirtuins, AMPK, autophagy) switch on. These changes have been associated with extended lifespan across yeast, worms, flies, and mice — though human lifespan data is still emerging.
Practical implementation
- Start with a 12:12 eating window (no food between 8 PM and 8 AM), then compress over weeks toward 16:8 or 18:6 if it fits your life.
- Keep coffee, tea, and water during the fasting window.
- Stop eating at least three hours before bed to align with circadian biology and protect sleep quality.
Cold exposure
Sinclair has been vocal about including brief cold exposure in his weekly routine — typically cold showers or short outdoor cold exposure rather than formal ice baths. The goal is not endurance or suffering but a sharp, brief stressor that nudges the body's adaptive systems.
The proposed mechanisms include brown adipose tissue activation, a spike in norepinephrine (which has downstream effects on mood and focus), and mild mitochondrial stress that triggers mitochondrial biogenesis. The strongest evidence for cold exposure's specific effect on aging in humans is still limited, but its cardiovascular and metabolic signals are reasonably well supported.
What counts as cold exposure
Sinclair does not prescribe temperatures or durations, but the consensus in the field (including Andrew Huberman's summaries of the research) is that a cold shower of 1 to 3 minutes at roughly 10–15°C / 50–60°F, three to four times per week, is enough to get the main signaling benefit.
Supplements: Sinclair's personal stack
Based on his own public disclosures, Sinclair's supplement stack has included:
- NMN (nicotinamide mononucleotide) — a precursor to NAD+, the coenzyme whose levels decline with age and which is central to sirtuin activity.
- Resveratrol — taken with yogurt or olive oil for better absorption, a sirtuin-activating polyphenol originally discovered in red wine.
- Metformin — a prescription diabetes drug used off-label for its putative longevity effects, currently under clinical investigation in the TAME trial.
- Vitamin D3, vitamin K2, omega-3 — standard support for cardiovascular and bone health.
- Statin — for cardiovascular prevention, prescribed by his doctor.
Important
Sinclair is not recommending his stack for other people. He has said multiple times that he is "experimenting on himself" and that each of these compounds has ongoing research, potential side effects, and drug interactions. LYF+ does not track or recommend supplements. If you are considering any of these, talk to a qualified physician first.
What LYF+ can track from the Sinclair protocol
LYF+ does not prescribe fasting windows, supplements, or drugs. What LYF+ does is measure the lifestyle foundation Sinclair's research points to — and let you see whether your daily habits are actually moving in the direction his science supports.
When you select the David Sinclair Protocol during LYF+ onboarding, the app tunes its notifications around:
- Meal timing consistency — LYF+ uses the Regularity pillar to track whether your circadian rhythm stays stable day to day, which is tightly linked to eating windows.
- Resting heart rate and HRV — both responsive to cold exposure and fasting protocols. The Recovery pillar surfaces these from Apple Watch.
- Sleep quality — fasting and cold exposure have a measurable effect on sleep architecture. If your score drops when you push fasting too hard, LYF+ flags it.
- Daily step count and activity volume — Sinclair's book emphasizes being physically active daily as a foundation, and the Activity pillar makes this visible.
Follow the Sinclair lifestyle foundation on iPhone
Choose the David Sinclair Protocol in LYF+ to get daily reminders around fasting windows, sleep, recovery, and circadian regularity.
Is the Sinclair protocol right for you?
The lifestyle parts of the Sinclair protocol — eating in a compressed window, brief cold exposure, moving daily, plant-forward eating — are low-risk and broadly supported by aging research. They are a reasonable starting point for most healthy adults.
The supplement and pharmaceutical parts are a different story. NMN, resveratrol, metformin and statins are biologically active compounds with real trade-offs, and the question of whether they actually extend human lifespan is unresolved. Sinclair himself treats them as experimental. Copying someone else's stack without bloodwork and medical context is not a good idea.
The practical takeaway: the free, no-prescription parts of Sinclair's protocol are the ones to focus on first, and the ones LYF+ is designed to help you track consistently.