No food is allowed during the fasting period, but you can drink water, coffee, tea and other non-caloric beverages. Some forms of intermittent fasting allow small amounts of low-calorie foods during the fasting period. Taking supplements is generally allowed while fasting, as long as there are no calories in them.

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Coffee

You can drink it black. Black coffee is calorie-free, so it’s fine to enjoy during the fasting phase. But adding in sugar, cream, or milk is best avoided, as it can add calories to the drink that can take you out of a fasted state.

“If you do want to flavor your coffee during a fast, experiment with calorie-free flavoring from a spice like cinnamon,” says Palinski-Wade. “Save the coffee add-ons for your non-fast windows of time.”

Tea

Go for it. Just like coffee, tea is naturally calorie-free and fine to have during a fast, so long as it’s simply brewed tea that comes from tea bags, leaves, or flakes. Bottled ice tea is often heavily sweetened, so if you go that route, make sure you’re opting for one that is unsweetened and not loaded with added sugar and calories, says Palinski-Wade. Caloric add-ons such as honey, milk or cream should be reserved for non-fasting times, just like with coffee.

“Since tea is naturally lower in caffeine than coffee, you can have a bit more during fasts, however I would still recommend opting for decaf when possible,” she says.

Water and seltzer

Drink up. Water is naturally calorie-free so there’s no need to restrict it, says Palinski-Wade. Water in general is a good idea to sip on during fasting times to ensure hydration but also as a way to fill your stomach and prevent hunger.