Can You Take Psyllium Husk While Intermittent Fasting?

Written by Andrew Brewer. ⚕️Reviewed and fact checked by our medical team.

Can you take psyllium husk while intermittent fasting

If you struggle to get enough fiber in your diet, then psyllium husk may be your new best friend. This is a soluble fiber that’s often found in gentle bulk-forming laxatives. It’s safe and often used to treat constipation and diarrhea, irritable bowel syndrome, and hemorrhoids. Some people even use it to help regulate their blood sugar levels.

Psyllium husk is a fantastic multi-purpose supplement, but is it safe to take while intermittent fasting without breaking your fast? It depends! Psyllium husk contains calories, so it technically breaks your fast. However, it does not cause an insulin reaction in your body, so you could take it while fasting. It really depends on you and how strictly adhering to your intermittent fast.

Key Takeaways

  • Psyllium husk is a safe and effective supplement for treating constipation, diarrhea, IBS, hemorrhoids, and regulating blood sugar levels.
  • Psyllium husk supplements are safe to take during intermittent fasting without breaking ketosis, as they do not cause an insulin reaction in the body.
  • However, psyllium husk supplements do contain calories, so if you’re focusing on calorie intake during your fasting window, you should reserve taking them for your eating window.
  • When choosing a psyllium husk supplement, read the nutritional label to ensure that it does not contain other ingredients that may break your fast.
  • Drinking enough water is important when taking psyllium husk supplements to avoid digestive discomfort.

Does Psyllium Husk Break Ketosis?

When you’re intermittent fasting, you want to hit ketosis. That’s the state when your body is no longer burning glucose for energy. Instead, it’s converting your body’s fat stores to ketones for energy. When your body is in ketosis, that’s when the weight loss magic happens, so you want to avoid breaking the state during fasting windows.

Taking psyllium husk supplements is not thought to break ketosis, so it may not break your fast. This is because it does not cause an insulin reaction in your body. One serving size of psyllium husk typically contains four grams of carbs, which normally would break your fast. However, the calories and carbs come from indigestible, soluble fiber, which does not impact your body’s blood sugar. Without that spike, you stay in ketosis. Instead, taking psyllium husk can help reduce your hunger and help your digestive system to heal.

Remember, the quality of psyllium husk supplements can vary between brands. To ensure its effectiveness and purity, it’s advisable to choose only the best psyllium husk supplements on the market. High-quality products will not only assure you of their benefits but also reduce any potential risks or impurities

Could Psyllium Husk Break My Fast?

On its own, psyllium husk will not break your fast, but take care to read the nutritional label before using it. Some brands contain other ingredients that may break your fast, including flavorings, sweeteners, and more.

Additionally, it depends on how you are intermittent fasting. If you’re only focused on ketosis, you should be fine to take these during fasting and eating windows alike. However, if you’re focused on calories, you will want to reserve taking psyllium husk to your eating windows. Psyllium husk supplements contain calories, so they will break your fast.

Taking psyllium husk can reduce hunger pains, which could help you power through your fasting windows. The benefits could outweigh the few calories it costs, so you’ll want to consider them accordingly. For example, if you add a no-calorie sweetener to your tea, it may not have calories, but it still could trigger an insulin response. Which is worse, eating calories or breaking ketosis? It’s up to you to decide but weigh the pros and cons to make the best decision for you.

When Should I take Psyllium Husk?

Most people take psyllium husk when they’re feeling constipated, but there are more benefits than meets the eye for this supplement. It can also help with diarrhea, IBS, and other digestional tract issues. Studies have shown it could help improve and balance blood sugar in those who are pre-diabetic or diabetic. After taking psyllium husk, you may feel bloated or gassy in rare cases. Drink enough water when you’re taking these supplements to get the best results.


Psyllium husk is powerful and can help your body adjust to intermittent fasting, curbing hunger pains and saving you from any digestional discomfort. It will not break ketosis, so it is safe to take during fasting windows as long as you don’t count calories. Because it does not trigger an insulin response, you may be able to excuse the handful of calories this wonder supplement contains.


  • Can I take psyllium husk while intermittent fasting?

Yes, you can take psyllium husk while intermittent fasting. Psyllium husk is a low-calorie supplement that can help you feel fuller for longer periods, which may help you stick to your fasting schedule.

  • Will taking psyllium husk break my fast?

No, taking psyllium husk will not break your fast. Psyllium husk is a low-calorie supplement that is unlikely to significantly impact your body’s insulin levels, which are the primary concern when it comes to breaking a fast.

  • How should I take psyllium husk while intermittent fasting?

You can take psyllium husk while intermittent fasting in a variety of ways. Some people prefer to mix it with water and drink it before or during their fast, while others prefer to take it in capsule form. Staying hydrated when taking psyllium husk is essential, as it absorbs water and can cause digestive issues if not consumed with enough water.

  • What are the potential benefits of taking psyllium husk while intermittent fasting?

Taking psyllium husk while intermittent fasting can have several potential benefits, including increased feelings of fullness, improved digestion, and better blood sugar control. Additionally, psyllium husk can help reduce cholesterol levels and promote healthy bowel movements.

  • Are there any potential side effects of taking psyllium husk while intermittent fasting?

While psyllium husk is generally considered safe, some people may experience digestive issues such as bloating, gas, or constipation. Drinking plenty of water when taking psyllium husk is essential to avoid these potential side effects. Additionally, if you have a medical condition or are taking medication, you should consult your healthcare provider before taking psyllium husk.

Andrew Brewer

Andrew Brewer

Andrew Brewer started to give people the guidance that he never received when he was first starting. His goal is to make your goals achievable and to offer you only the best fasting apps that the internet has to offer. You're not on your own - Andrew and the entire family of reviewers at are here with you every step of the way!