Can You Drink Coffee While Intermittent Fasting?

It’s the most common fasting question of all, and the answer is reassuring: black coffee does not break a fast. In fact, it can make fasting noticeably easier. The details are worth knowing, though.

Black coffee is fine

Plain black coffee has virtually no calories, so it won’t interrupt the fasted state most people are after. It also mildly suppresses appetite and gives you a warm, satisfying ritual during the hardest fasting hours. Tea — black, green or herbal, unsweetened — works the same way.

What turns coffee into a fast-breaker

The trouble starts with what you add.

• Milk, cream or oat milk — even a splash adds calories and protein
• Sugar, syrups and honey — the clearest fast-breakers
• ‘Bulletproof’ butter or MCT oil — fine for some goals, but they do add calories
• Sweeteners — zero-calorie ones are debated; if you’re strict, skip them

A practical rule

If your coffee is clear-to-black and unsweetened, drink it freely. If it’s pale and creamy, treat it as part of your eating window. When in doubt, keep it to water and black coffee — and use our free fasting timer to keep your window honest.