Which Form?
Fasting
Strong
consensus
Available Forms
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).
Dosage & Timing
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)
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
Expert Positions
What Each Expert Says
Huberman has two dedicated fasting episodes plus a guest interview with Dr. Satchin Panda. He provides the most actionable protocol: an 8-hour feeding window, no food for 1 hour after waking or 2-3 hours before bed, with consistent timing. He explains how eating raises blood glucose and insulin while fasting activates different hormonal pathways, and references Panda's 2012 mouse study showing time-restricted feeding prevents metabolic disease even on a high-fat diet. He also discusses how intermittent fasting improves liver enzymes and insulin sensitivity, and cautions about the sex-specific risks for active women via Dr. Stacy Sims.
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