¿Rompe Black coffee un ayuno?
Black coffee no rompe un ayuno cuando se usa según las indicaciones — su impacto en calorías e insulina es despreciable para objetivos de ayuno estándar.
Calorías
~2 kcal per 240 ml cup (unsweetened, no milk)
Por qué — la lógica de calorías e insulina
Plain black coffee contains roughly 2 kcal per cup — far below any calorie threshold that would trigger a meaningful insulin or digestive response. Caffeine may modestly increase fatty-acid mobilisation, which is consistent with — not disruptive to — the fat-burning phase of a fast.
¿Depende de tu objetivo de ayuno?
For weight loss and metabolic health, black coffee is broadly considered fast-safe. For strict autophagy fasting, evidence is mixed: some researchers note that caffeine may stimulate mTOR signalling, potentially blunting autophagy; others find no meaningful effect at typical doses. If autophagy is your primary goal, plain water is the safest choice.
Preguntas frecuentes
- Does black coffee break a 16:8 fast?
- No. Black coffee without milk, cream, or sweetener contains roughly 2 kcal per cup, which is negligible for weight-loss and metabolic fasting goals. It does not cause an insulin spike.
- Can I add anything to my coffee while fasting?
- Adding milk, cream, sugar, syrups, or MCT oil adds calories and can trigger an insulin response, which breaks a fast for most goals. Keep it plain: coffee and water only.