Expert Consensus Score
Fasting
Strong Consensus
out of 5
Based on 24 videos across 5 experts · Updated 2026-03-19
Expert Positions
The Verdict
All 5 experts endorse some form of fasting, but they differ substantially on protocol and emphasis. Huberman and Patrick are the strongest advocates, with dedicated episodes covering time-restricted feeding and its circadian, metabolic, and autophagy benefits. Johnson practices a strict 20-hour fast daily. Hyman practices a 14-hour overnight fast and frames fasting as a hormetic stress. Attia is the most cautious — he experimented extensively with prolonged fasting but moved away from it due to muscle loss concerns and a lack of objective biomarkers proving benefit.
Quick Protocol
Dosage
8-12 hour eating window for daily time-restricted feeding (Huberman: 8 hours; Patrick/Panda: 9-12 hours). Johnson practices a more extreme 4-hour eating window (20-hour fast).
Form
Time-restricted eating (daily), periodic prolonged fasting (2-5 days, quarterly — Attia/Longo), or fasting-mimicking diet (5-day protocol, monthly to quarterly — Longo/Patrick).
Timing
Avoid food for at least 1 hour after waking and 2-3 hours before bed (Huberman). Place the feeding window consistently within the 24-hour cycle to align with circadian rhythms. Early-day protein intake may benefit muscle maintenance and hormone optimization.
Key Findings
- Time-restricted feeding (8-12 hour eating window) prevents metabolic disease and obesity in mice, even on a high-fat diet, by aligning food intake with circadian rhythms (Huberman, citing Satchin Panda 2012 study).
- Autophagy — the cell's self-cleaning mechanism — typically activates after 14-16 hours of fasting in humans (Hyman). True deep autophagy may require several days of fasting, not just overnight (Patrick, citing Guido Kroemer).
- Fasting lowers insulin and blood glucose while activating longevity genes like sirtuins and downregulating mTOR, pathways critical for cellular repair and longevity (Huberman, Patrick).
- Fasting-mimicking diets can trigger stem cell activation during the refeeding phase, rejuvenate the immune system, and improve biomarkers for aging and disease risk (Patrick, citing Valter Longo clinical trials).
+ 3 more findings in the full report
Read the Full Fasting Report
Expert deep dives, video citations with timestamps, risks, synergies, and detailed protocol.
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