(updated October 13th, 2026)
Yes. It’s the milk that does it, not the coffee. A traditional cappuccino is about 65 calories, and almost all of that is milk; the espresso in it is worth about 2. So black coffee and espresso can usually sit inside a fast, and a cappuccino can’t.
Can you drink cappuccino while intermittent fasting?
Not during the fasting hours. Johns Hopkins Medicine’s guide to intermittent fasting lists just two things for the fasting window: water, and zero-calorie drinks such as black coffee and tea. A cappuccino isn’t zero-calorie, so it belongs in your eating window instead.
That’s less of a sacrifice than it sounds. If you’re on a 16/8 schedule, for example, the cappuccino just moves to the start of your eight eating hours, and it makes a good first thing to have when the fast ends.
How much milk breaks a fast?
Strictly, any. The guidance above draws the line at zero calories, and milk has calories in every amount, so even a splash technically ends the fast. Oat, almond and other plant milks are the same: none of them are zero-calorie either.
You’ll see looser rules online, usually some version of “a little milk is fine”. I couldn’t find a medical source that sets a safe amount, so I wouldn’t rely on one. If you want a coffee during the fast, have it black.
What can you drink while fasting instead?
Going by the Johns Hopkins list, these all fit inside a fasting window:
- Water, still or sparkling, as long as it’s unflavored.
- An espresso. It’s black coffee, just a small amount of it.
- An americano, which is espresso topped up with hot water, so it’s black coffee too.
- Black filter coffee or plain tea, with no milk and no sugar.
If it’s the coffee taste you miss, an americano is the closest you’ll get to a cappuccino without the milk.
What about a fasting blood test or a religious fast?
Both are stricter than intermittent fasting, and a black coffee doesn’t pass either. For a blood test, MedlinePlus is clear that you shouldn’t eat or drink anything except plain water, usually for 8 to 12 hours beforehand, because coffee and other drinks can get into your bloodstream and affect the results. Cleveland Clinic adds that this includes black coffee, since caffeine itself can skew some results. Have your cappuccino after the test, and follow your own provider’s instructions if they differ.
Fasting during Ramadan means no food or drink at all from dawn to sunset, as Mayo Clinic Health System describes it, so a cappuccino waits until after sunset along with everything else.
