Circadian / Time-Restricted Eating
Satchin Panda's time-restricted eating confines all food to a consistent 8-to-10-hour daytime window. It ramps in gently from 12 hours down by about an hour a week. In a human trial, a 10-hour window improved metabolic-syndrome markers without cutting calories or adding exercise; consistency day to day, not a heroic single fast, is what matters.
Panda's research shows that when you eat matters as much as what you eat. The protocol confines all food to a consistent daytime window, ideally 8 to 10 hours, with the first bite mid-morning and the last bite early evening. You ramp in gently: start with a 12-hour window and narrow it by about an hour a week. Consistency day to day is the active ingredient; a window that drifts by hours loses the benefit.
Why it works▼
Begin with a 12-hour window
An achievable on-ramp; most people are eating across 13 to 15 hours without realising it.
Reduce to a consistent 8 to 10 hours
The metabolic benefit shows up in the 8 to 10 hour range held consistently.
Eat earlier, front-load the day
Insulin sensitivity is highest earlier; late eating works against the clock.
Stop eating about 3 hours before bed
Protects both sleep quality and overnight metabolic repair.
Bright light by day, dim light at night
The clock is set by light as well as food; the two reinforce each other.
Log your real eating window
Most people are surprised how wide their actual window is; measuring fixes it.
- Late-night eaters
- Metabolic-health and energy goals
- Poor or restless sleepers
- Anyone who wants a free, simple change
- History of disordered eating: time-restricted eating can become restrictive; avoid and speak with a clinician
- Diabetes or any medication with meal timing (insulin, sulfonylureas): coordinate with a doctor first
- Pregnancy, or being underweight: do not restrict the eating window
- This is about timing, not calorie cutting; keep meals nourishing
- Educational only, not medical advice
- July 3, 2026 Protocol published.
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Not medical advice. This page is for education only and is not a substitute for professional medical care. Consult a qualified clinician before changing your health routine.
Independent curation. YourProtocol.ai is an independent platform. This protocol is based on the publicly available work of Satchin Panda and is not created, reviewed, endorsed by, or affiliated with Satchin Panda or Circadian Biologist · Salk Institute.