What Can I Eat or Drink While Fasting?
15 Dec 2025 · 8 min
Cynthia Thurlow explains what won't break your fast: black coffee, unsweetened tea, and water are safe. Skip fat-soluble vitamins, BCAAs, collagen, protein powder, bone broth, gum, and mints, since they trigger insulin and end the fasting window.
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I Eat or Drink While Fasting? This is JJ Virgin, four time New York Times bestselling author, celebrity nutrition expert and and Fitness hall of Famer. I've been on a lifelong quest for answers to the toughest health questions, and now I'm sharing what I found with you. Welcome to Ask the Health Expert. Lori from Twitter asks, what can I eat or drink while fasting? Hey, it's J.J. and I've got the perfect expert to answer this question. Meet nurse practitioner, nutrition and intermittent fasting expert Cynthia thurlow. Her Her TEDx talk on intermittent fasting has been viewed over 5 million times. She's a former varsity field hockey player who's been known to read four to five books at a setting. We'll be right back with the answer. Hey, J.J. virgin here. Okay, real talk. So often the holidays sneak up on me, travel, gifts, hosting, you know, all the things. And suddenly it's like, wait, who spent what and where? And I know I'm not the only one who's looked at a bill in January and thought, wow, that escalated quickly. If you want to keep your finances under control this holiday season, you need to be using Monarch. It's rated the Wall Street Journal's best budgeting app of 2025. Monarch is the all in one personal finance tool that brings your entire financial life together in one clean interface. On your laptop or on your phone, Monarch lets you link everything and gives you real time visibility so you're not shocked later. Right now, I've been checking the holiday spending category so I don't accidentally start the new year with that dreaded debt hangover. And honestly, just seeing everything laid out is already helping me stay more aware. This season, Monarch does the heavy lifting. It links your accounts in minutes, gives you smart categorization and super clear visuals. Yes, that end of year reset could be a real goal. This time, don't let financial opportunity slip through the cracks. Use the code virginonarch.com in your browser for half off your first year. That's 50% off your first year@monarch.com with the code Virgin.
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Well, Lori, the standard response that I usually give when I'm asked this question is plain coffee, bitter teas. Bitter teas mean teas that are not sweet. So green tea, black tea, you know, teas that are not designed to stimulate an insulin response are going to be the ones you're going to focus on. Obviously you want to drink a good amount of hydration, so lots of water. Really also very, very important. And there appears to be a lot of consensus, non consensus about what you can consume without breaking your fast. I tend to be much more of a purist. And things that will feed an insulin response you want to avoid. And those kinds of things would be certain types of vitamins. So obviously fat soluble vitamins, vitamin A, vitamin D, E and K, branched chain, amount of acids, collagen, peptides, protein powders, bone broth will all break your fast. Your body will need to stimulate the secretion of insulin in order to properly assimilate those items. Things like gum and candy and breath mints. But you can brush your teeth safely as long as you're not swallowing your toothpaste and just being mindful of the items that you are putting in your mouth. Because we know this cephalic phase insulin response can be evoked by just smelling food. I only share this just to illustrate the point that our bodies are very sensitive and attuned to our surroundings. The things we smell, the things we are exposed to for taste, and the food that we see as our body gets primed to eat food. So you really want to be mindful. But number one is plain coffee, number two are bitter teas, number three is plain water. And then I've illustrated some of the more common questions I get with regard to things that can break your fast. So really focusing in on ensuring that the time that you are fasted is maximized by not consuming fats and not consuming carbs and not consuming protein, but just those things. And the really cool thing about both black coffee and bitter teas is that they actually have components in them and that can actually improve autophagy, which is that spring cleaning of the cells. So definitely enjoy the tea, enjoy the coffee while fasted.
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