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No, plain black coffee (about 2 kcal per cup) doesn’t break the fasted state for typical intermittent fasting goals.

Yes, black coffee usually fits fasting on keto, but add-ins with calories can end the fast or blunt its intended benefits.

Yes, coffee with soy milk breaks a fast; soy milk adds calories, protein, and carbs that end a metabolic fasting state.

Yes, coffee with heavy cream breaks a strict fast; black coffee alone usually fits most fasting goals.

Yes, any cream adds calories that technically end a fast; some plans allow tiny amounts if the goal isn’t strict metabolic fasting.

Yes—any milk adds calories and insulin-active nutrients, so strict fasting is broken; tiny amounts may still fit weight-loss-focused fasting.

Yes, a flat white breaks a calorie-restricted fast because the milk adds energy and prompts a metabolic response.

Yes, a dash of milk ends a strict fast; for time-restricted eating, a small splash is usually fine if total calories stay near zero.

Yes, tea with milk ends a strict fast; for weight-loss fasts, a small splash adds calories and may be acceptable.