is intermittent fasting bad for your stomach

Is Intermittent Fasting Bad for Your Stomach?

Andrew Brewer - Intermittent Fasting Expert

Written by Andrew Brewer. Updated on December 2022.

Medically reviewed and fact checked by our team.

is intermittent fasting bad for your stomach

The longer your fast goes, the more you’ll be painfully aware of the aching sensation in your stomach. It’s rumbling because you’re starving. Maybe you’re even starting to feel hunger pains as you go longer without food. You’re trying to convince yourself that these are normal feelings. It’s just your body getting used to the fast.

This is the hard part, but you’re committed to pushing on. Your body will start to convert its fat stores, and in no time, you’ll feel more comfortable, happy, and healthy. Still, you can’t help but wonder if intermittent fasting is bad for your stomach.

Intermittent fasting is not bad for your stomach. In fact, studies have shown that it may even be beneficial to your long-term health in addition to helping you lose weight. According to researchers at Cedars-Sinai, your gut microbiome changes as you fast. Some of the bacteria are responsive to fasting, helping them grow. With time and consistent intermittent fasting, you may be able to permanently grow the positive bacteria in your gut, which could yield longer-term health benefits.

More research is needed to determine the validity of this theory, but the initial results are positive. Intermittent fasting can also kickstart your metabolism, helping burn fat as you look to lose weight. Your body will acclimate to intermittent fasting after a few cycles, and fasting apps can help you on your journey.

Side Effects of Intermittent Fasting

Intermittent fasting is not without its risks, and you should not try this eating style if you have previously suffered from an eating disorder or have taken certain medicines. You can consult with a doctor if you have any concerns about how intermittent fasting will impact your daily life.

While it’s not bad for your stomach, intermittent fasting may make you feel sick if you’re not used to it. You may feel tired and lethargic as your body gets used to your new eating habit. Some people report feeling headaches, getting hair loss, facing changes in their menstrual cycle, and suffering from insomnia.

As for your stomach, in addition to the embarrassing grumbling noises, you may face constipation, diarrhea, nausea, and bloating. If you don’t increase your fluid intake, you may also suffer from dehydration. Intermittent fasting is a complete overhaul of how you’re eating, and it may be a shock to your system if you don’t properly ramp up to your plans.

These side effects vary from person to person, so it’s important to discuss any issues with your doctor. You may be able to treat these issues with simple changes to your diet, including eating more fiber-rich foods.

So Is Intermittent Fasting Bad for You?

No, intermittent fasting is not bad for you, but it’s not right for every person. You should not consider it if you currently have or have had issues with food in the past. Intermittent fasting requires a lot of self-control. You don’t want to start binge eating or overeating during your non-fasting periods because this will be detrimental to your progress. Instead, treat intermittent fasting as a way to connect with yourself on a spiritual level, learning what makes you tick in ways you’d never previously considered.

Your body may play tricks on you in the beginning. You’ll suddenly crave sugar or carbs but resist the urge. Your body is simply learning to re-process healthy foods while getting away from highly processed foods. Intermittent fasting is a journey, which is why different programs can meet you where you feel the most comfortable. It won’t always be pleasant, but it will drive meaningful results if you stick with it!


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!

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