12:12 Circadian
Natural Day-Night Harmony
12:12 mirrors traditional meal timing before artificial light and late-night food access. By simply not eating after dinner until breakfast, your gut and liver follow natural circadian rhythms.
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12:12 Circadian • 12:12 Time-Restricted Protocol
Nutrients from the preceding meal are digested and absorbed, during which circulating glucose and insulin naturally respond.
As nutrient absorption completes, insulin levels generally trend toward baseline, and stored glycogen is gradually utilized.
As liver glycogen gradually depletes, the body typically increases reliance on fatty acids for resting energy needs.
Extended nutrient pauses are associated in scientific models with cellular maintenance signals (including AMPK and mTOR pathways).
How the 12:12 Circadian Works in Practice
Under the 12:12 protocol, each 24-hour cycle is segmented into a continuous 12-hour fasting period followed by an 12-hour feeding window. Fasting begins the moment your final evening meal concludes.
Biological Focus & Benefits
Fasting Rules for 12:12
- Drink abundant water, sparkling water, or unsweetened tea.
- Avoid added sugars, milks, or snacks during fasting hours.
- Break fast with whole protein and healthy fats.
- Shift window by 1–2 hours if necessary for social life.
If at any point during your fast you experience extreme dizziness, nausea, or shaking, break your fast immediately. Fasting is not advised for pregnant/nursing mothers or individuals with eating disorders.