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What can you drink while fasting?
Low- and no-calorie drinks are allowed, while calories end a zero-calorie fast and fluid loss can raise hydration needs, experts said.
While fasting, you can drink water, sugar-free electrolyte water, black coffee, plain tea, and sparkling water, as these beverages are close enough to calorie-free for most fasting goals.
Technically, consuming any food, drink, or supplement that contains calories ends a zero-calorie fast, with your exact metabolic response depending on the amount and type of calories consumed.
Avoid sugary sports drinks, fruit juice, and bone broth, which contains about 50 calories and 9 grams of protein per cup, making it break a fast.
During fasting, glycogen depletion and increased sodium excretion can lead to greater fluid loss, but replacing both fluid and electrolytes can help you stay hydrated and feel better.
For most practical goals like weight loss, small amounts of calories are unlikely to meaningfully disrupt fasting effects, and you can adjust your fluid intake based on your body, activity, and environment.