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Yes, plain black coffee is fine during a 72-hour fast, as long as you avoid calories from creamers, milk, sugar, and flavored syrups.

Yes, plain black coffee fits most fasting plans; skip sugar, cream, and sweetened creamers during the fasting window.

No, black coffee before fasting blood work can skew results; drink only water unless your clinician gives different directions.

No, AG1 breaks a strict fast; drink it during your eating window or with your first meal.

No, a strict water fast excludes apple cider vinegar; the acid and trace calories count as intake and may irritate your stomach.

Yes, amino supplements interrupt a strict zero-calorie fast; plain electrolytes keep a true fast intact.

Yes, almond milk in coffee adds calories and ends a strict fast; black coffee stays safest for fasting goals.

Yes, calorie-free energy drinks can fit fasting, but sugary or creamy versions break the fast due to calories.

Yes, Coke Zero during a fasting window is generally allowed, but strict water-only fasts and medical fasts exclude sweetened drinks.

No—smoking breaks religious fasts and can skew medical fasts; in calorie-only fasts it adds no calories but undermines metabolic benefits.