Does black coffee break a fast?
Likely okay for fasting
0-5 kcal
Yes - fasting-safe. Black coffee is very low calorie and commonly used during intermittent fasting.
Black coffee is very low calorie and commonly used during intermittent fasting.
Brewed black coffee is roughly 2 kcal per 8 oz and does not meaningfully raise blood glucose or insulin — widely accepted as fast-safe in IF research.
Base tier: 92/100 for "Fast-safe". Item adjustment: +3 points for calories, nutrient signal, product variability, and safety caution. Final Fast Score: 95/100.
Skip sugar, milk, cream, collagen, and flavored syrups until the eating window.
The Fast Score is an editorial estimate of clean-fast strictness, not medical advice. Goals vary — if you fast for glucose, appetite, or medical reasons, follow your clinician.