That said, I would say stick to as close to zero calories as you can during your fasting hours with plenty of clean filtered water herbal teas are also good." "I would say if you're drinking organic black coffee-no cream, no sweeteners-then you should be fine. We don't have any good evidence to show either way," says Vincent Pedre, M.D., an integrative physician and gut health expert who frequently recommends intermittent fasting diets to his patients. "I've heard good debates about whether coffee can break a fast. Others aren't so sure we need to be quite this nitpicky, though. "In humans, it appears that autophagy does not remain as active when any food is consumed," he says.īut what if we're talking about a measly 2 to 5 calories in a cup of tea or coffee? This ultra-low-calorie territory is where things get a little tricky.Īccording to Horne, it likely needs to be a water-only fast to maintain the maximum benefit from autophagy. According to Horne, some mechanisms behind fasting's benefits, like ketosis (which increases fat burn), remain active with the consumption of certain macronutrients but others, like autophagy, may or may not remain active. Hate to break it to you, but "technically, consuming any calories breaks a fast," says Benjamin Horne, Ph.D., a genetic epidemiologist who has published research on the effects of intermittent fasting.Įven a few calories' worth of food can inactivate some of fasting's perks.
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