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No, coffee with olive oil breaks a calorie-based fast; plain coffee fits most fasting rules.

Yes—adding sugar to coffee ends an intermittent-fasting window; plain black coffee is fine.

Yes, a zero-calorie cola generally fits a fasting window, but sweeteners may nudge appetite or insulin for some people.

Yes, coffee during a fasting window is fine when it’s black and calorie-free; sweeteners, milk, or cream end the fast.

Yes, black coffee during a fasting window adds near-zero calories and usually keeps a metabolic fast intact.

Yes—coffee can skew fasting blood work; for accurate results, fasting means water only unless your clinician says otherwise.

Yes, plain coffee is allowed during an egg-only fast, but keep it unsweetened and be careful with creamers and sweeteners.

Yes, plain black coffee is usually allowed during a water-only fast; any sugar, milk, cream, or flavors end a calorie-strict fast.

Yes, black coffee fits most liquid fasts; any calories from sugar, milk, cream, oil, or collagen break the fast.

Yes, morning coffee during intermittent fasting is fine if it’s plain and calorie-free; sweeteners, milk, and cream end a strict fast.