Intermittent fasting

Mon, 06 Jul 2026 00:00:00 +0000

Eating within a compressed daily window (or occasionally skipping longer) is a low-cost way to pull the hormesis lever: it lowers mTOR, raises AMPK, and triggers autophagy — the body’s cleanup of damaged tissue.

Why it may work

When the stomach is empty, the body is freer to digest waste tissue (autophagy) instead of processing incoming food (Longevity).
Calorie restriction is a stressor that appears to slow aging — the same AMPK/adversity mechanism as cold and exercise (Sinclair).
Ketosis: the two easy routes into it are restricting carbs or fasting; mitochondria run more efficiently on ketones than glucose (Head Strong).

Common protocols on file

16:8 — Sinclair fasts ~16 hours, drinks hot water/coffee/tea through it, eats nuts if he must (Sinclair).
The 12–8pm window — Karpathy’s time-restricted eating; the practical default (Food).
One meal a day (OMAD) — Jack Dorsey frames it as a “boring superpower” for mental clarity; three meals is a social structure, not a biological requirement (Jack Dorsey).
Longer fasts (a day+, not beyond a week to avoid muscle loss) — deep autophagy after ~3 days; the liver learns to regulate glucose after ~3 weeks of practice (Sinclair).

Caveats

Muscle is the priority — don’t fast your way into losing it (see strength training); longer fasts risk muscle loss.
Most of the aggressive claims come from Sinclair’s contested framework (supplements). Time-restricted eating is the low-risk core; extended fasting is more experimental.

Hormesis · Nutrition for longevity · Strength training for longevity

Fasting on Today Purpose

Intermittent fasting

Why it may work

Common protocols on file

Caveats

Citations

Fasting on Today Purpose

Intermittent fasting

Why it may work

Common protocols on file

Caveats

Related

Citations