is intermittent fasting bad for your stomach

Is Intermittent Fasting Bad for Your Stomach?

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

Key Takeaways

  • Intermittent fasting is generally not bad for your stomach, and may even have potential benefits for gut health.
  • However, intermittent fasting may cause side effects, such as headaches, fatigue, and gastrointestinal issues, particularly during the initial stages of adapting to the eating pattern.
  • Intermittent fasting is not suitable for everyone, and it is important to consult with a healthcare professional before starting this eating pattern, especially if you have a history of eating disorders or are taking certain medications.
  • Intermittent fasting requires self-control and may not be easy to follow in the beginning, but can be effective in achieving weight loss and improving overall health if done properly and consistently.
  • Different programs of intermittent fasting are available to meet individual needs and comfort levels, but it is crucial to properly ramp up and monitor any changes to avoid potential negative effects.

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!


  • Can intermittent fasting cause stomach issues?

Intermittent fasting may cause stomach issues in some people, such as bloating, constipation, and acid reflux. However, these side effects are temporary and can be managed with dietary modifications.

  • What are the potential benefits of intermittent fasting?

Intermittent fasting has been linked to numerous health benefits, including weight loss, improved insulin sensitivity, lower inflammation, and a reduced risk of chronic diseases such as heart disease and diabetes.

  • Is intermittent fasting safe for everyone?

Intermittent fasting may not be suitable for everyone, such as pregnant or breastfeeding women, people with a history of eating disorders, and individuals with certain medical conditions. Therefore, it is important to consult with a healthcare professional before starting intermittent fasting.

  • What are some common types of intermittent fasting?

Some common types of intermittent fasting include the 16/8 method, which involves fasting for 16 hours and eating during an 8-hour window, and the 5:2 diet, which involves eating normally for five days and restricting calories to 500-600 for two non-consecutive days.

  • Can intermittent fasting lead to nutritional deficiencies?

Intermittent fasting can lead to nutritional deficiencies if the diet is poorly planned. It is essential to ensure that sufficient nutrients are consumed during eating periods and to consult with a healthcare professional or registered dietitian before starting an intermittent fasting regimen.

  • How can I minimize stomach issues while intermittent fasting?

To minimize stomach issues while intermittent fasting, staying hydrated, consuming enough fiber, and avoiding consuming large meals or foods that trigger acid reflux is recommended. Additionally, gradually easing into the fasting regimen may help alleviate digestive discomfort.

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!