Research
Energy balance
Intermittent Fasting (IF) is defined as repetitive fasting periods lasting up to 48 hours each, including Time-Restricted Eating (TRE) and Alternate-Day Fasting (ADF).
Intermittent Fasting means you fast repeatedly, with each fast lasting no more than 48 hours. This includes popular methods like Time-Restricted Eating (eating within a daily window) and Alternate-Day Fasting. You do not need to restrict calories during eating windows if you choose TRE.
StrongSupportsVERY_HIGH confidence
Intermittent fasting (IF) refers to repetitive fasting periods lasting up to 48 h each. IF includes fasting regimens of 1 fasting day per week, 2 separate or consecutive fasting days per week, alternate-day fasting (ADF), and time-restricted eating (TRE).
Why this rating
Consensus achieved through 5 rounds of surveys and a live conference.
Source
International consensus on fasting terminology
Daniela A. Koppold et al. · Cell Metabolism · 2024
DOI 10.1016/j.cmet.2024.06.013
clinical_guideline · n=38Cited 89×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Fasting is defined as voluntary abstinence from some or all foods or beverages for preventive, therapeutic, religious, cultural, or other reasons, distinguishing it from starvation which is involuntary and pathological.Strong
- Time-Restricted Eating (TRE) is defined as restricting food and caloric beverage intake to a specific daily period, resulting in a fasting window of at least 14 hours, with no explicit limit on energy intake during eating hours.Strong
- Short-Term Fasting (STF) is defined as fasting regimens with a duration of 2–3 days, while Prolonged Fasting (PF) refers to regimens lasting 4 or more consecutive days.Strong
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