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No—bulletproof coffee contains calories, so drinking it during intermittent fasting ends the fast.

Yes, sipping caffeine won’t change mammogram results, though it can raise breast tenderness and make the exam less comfortable.

Yes, plain coffee before eating is generally fine for healthy adults, but it can stir heartburn or jitters in people who are sensitive.

Yes, eating an apple with coffee is fine for most people; separate them if you manage iron levels or reflux.

No, black coffee before fasting bloodwork isn’t allowed; only plain water is recommended unless your clinician says otherwise.

Yes, you may drink plain black coffee before anesthesia, but stop all clear liquids 2 hours before the scheduled procedure time.

Yes, small amounts of caffeine are usually fine after gallbladder surgery, but pause a few days and reintroduce slowly to judge tolerance.

Yes, black coffee or tea before a colonoscopy is usually allowed, but skip milk, creamers, and red or purple drinks.

Yes, small amounts of caffeine from clear drinks are usually OK before a colonoscopy—skip milk/creamer and stop by your prep’s clear-liquid cutoff.

Yes, having caffeine before a COVID-19 vaccine is fine—stick to your usual amount, eat a snack, and drink water.