Timing Protocol
When to Take Fasting — Expert Timing Protocols
Expert-analyzed timing recommendations for fasting based on what 5 longevity researchers say about when, how, and what to take it with.
Quick Timing Guide
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.
Strong Consensus
on Fasting overall
Full Protocol
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.
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).
Notes
Consistency of the feeding window matters more than the exact hours chosen. Light exercise (20-30 min walk) after the last meal can help transition into the fasted state. Salt water can help manage hunger and lightheadedness during fasting. Berberine can mimic some fasting effects on glucose disposal but should be used cautiously. Active women may need to approach fasting differently due to hormonal impacts.
Expert Positions
What Each Expert Says About Timing
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.
Unlock the Full Picture
Go beyond the consensus — see exactly what each expert says about fasting.
- Per-expert timing protocols & reasoning
- Interaction warnings & disagreements
- Video citations with timestamps