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No, celery juice contains calories and breaks a fasting window; save it for the eating period.

Yes, plain Celtic sea salt has zero calories, so a small pinch during a clean fast is generally fine; keep total sodium within daily limits.

No, butter-and-MCT coffee during intermittent fasting adds calories and breaks a fast; choose plain black coffee if you want to stay fasting.

No, bulletproof coffee contains calories that end a fasting period, even though plain black coffee is fine during the fasting window.

Yes, broth can fit some fasting styles, but any calories break a strict zero-calorie fast.

No, bulletproof coffee ends a fasting window because the added fats and calories interrupt a true fast.

No, bone broth contains calories and protein, so during a strict 72-hour water fast it breaks the fast—even small amounts.

Yes, fasting blood tests are done safely when the order fits the test and you follow the fasting rules.

Yes, black coffee fits most fasting setups; zero-calorie sweeteners may be fine for some goals, but small insulin effects can vary by person.

Yes, plain coffee during a fasting window is typically allowed; skip cream, sugar, and calories.