
The ketogenic, or keto, diet is a popular dieting trend, especially for those looking to lose weight quickly. The very-low-carb diet has been shown to offer several benefits, but it may not be for everyone. A common side effect of the keto diet is a change in bowel movements, including constipation or, less commonly, diarrhea. This is due to a lack of fiber and an increased amount of fat in the diet. Some people also experience more pungent bowel movements. These changes in bowel habits are likely due to the body adjusting to a new way of eating and may lessen over time.
| Characteristics | Values |
|---|---|
| Effect on bowels | Constipation, diarrhoea, changes in gut microbiome, more pungent bowel movements |
| Causes | Lack of fibre, increased fat content, dehydration, absence of carbs |
| Prevention and treatment | Drink more water, consume electrolytes (sodium and potassium), increase fibre intake, add more salt to food, reduce fat intake, examine magnesium intake |
| Considerations | Bowel movements vary from person to person, give your body time to adjust, consult a doctor if issues persist |
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What You'll Learn

Ketogenic diet and constipation
Constipation is a common problem for people starting the ketogenic diet, along with diarrhoea. This is due to the body adjusting to digesting fewer carbohydrates and more fat, as well as a potential lack of fibre. The keto diet can also affect the gut microbiome, which has been linked to immune and metabolic function.
The normal bowel movement range is from once per day to three times a week. However, if you experience fewer than three bowel movements per week, you may be constipated. This can also result in hard and lumpy stools, which are difficult to pass.
There are several ways to reduce the risk of constipation when on the keto diet. Firstly, ensure you are staying properly hydrated, as the keto diet can cause a loss of fluids. It is also important to consume enough electrolytes, such as sodium and potassium, as these are lost more easily on a ketogenic diet and can contribute to constipation. Additionally, increasing your intake of whole, high-fibre foods can help to keep your bowels moving.
If you are experiencing constipation, you may want to examine your magnesium intake, as this can impact bowel movements. However, it is important to consult a doctor before taking any supplements or minerals, as these can have side effects.
For some people, a cup of coffee may help to stimulate a bowel movement when constipated. However, this is not a reliable fix and may not work for everyone. It is also important to note that simply giving your body time to adjust to the new diet may help alleviate constipation.
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Diarrhea and the keto diet
The keto diet is a popular dieting trend that involves eating a high-fat, moderate-protein, and very low-carbohydrate diet. While the keto diet may help with weight loss, it can also lead to changes in the digestive tract and cause gastrointestinal (GI) issues such as constipation and, less commonly, diarrhea.
Causes of diarrhea on the keto diet
There are several reasons why someone may experience diarrhea when starting the keto diet:
- Dietary changes: Any significant change in diet can affect gastrointestinal health and cause diarrhea.
- Lack of fiber: The keto diet can be low in fiber, which can lead to constipation or diarrhea.
- Increased fat intake: A delay in the enzymes that digest fat can cause fat to travel into the colon, where it is digested by bacteria, leading to gas, bloating, and fat in the stool. This extra fat in the stool can cause looser stools, resulting in diarrhea.
- Dairy intolerance: Consuming more dairy products as a source of fat on the keto diet may reveal a dairy intolerance, with diarrhea being a common symptom.
- Sugar alcohols: Sugar-free and low-carb products often contain sugar alcohols, which can cause gastrointestinal upset and diarrhea.
- Gut microbiome changes: The keto diet may affect the gut microbiome, which is linked to immune and metabolic function, potentially leading to diarrhea.
Relieving and preventing diarrhea on the keto diet
If you are experiencing diarrhea on the keto diet, there are several steps you can take to relieve and prevent it:
- Stay hydrated: Drink plenty of water and sugar-free electrolyte beverages to replace lost fluids and electrolytes.
- Increase fiber intake: Eat more high-fiber, keto-friendly foods such as greens, cucumbers, broccoli, and cabbage to help regulate bowel movements.
- Reduce dairy intake: If you suspect a dairy intolerance, try reducing your dairy consumption and see if your symptoms improve.
- Ease into the diet: Instead of abruptly changing your diet, gradually reduce carbs and increase fats to give your body time to adjust to the new diet.
- Probiotics and prebiotics: Take probiotic supplements or increase your intake of probiotic- and prebiotic-rich foods to support gut health.
- Fermented foods: Eat fermented foods like sauerkraut and kimchi to improve digestion and reduce constipation or diarrhea.
- Limit coffee: While coffee can stimulate a bowel movement for some people, it is not a reliable fix for everyone and should not be depended on.
- Consult a healthcare professional: If your diarrhea is severe, persistent, or lasts longer than a week, consult a healthcare professional to ensure there are no underlying issues.
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The gut microbiome and keto
The ketogenic or keto diet is a popular dieting trend, particularly in the United States. It is a very-low-carb diet that can help with weight loss. However, like any significant dietary shift, it can cause changes in bowel movements. Constipation is a common issue for those starting the keto diet, and some people may also experience diarrhoea. These side effects are due to the absence of carbs and an increased amount of fat in the diet, which the body may struggle to adjust to.
The keto diet may also affect the gut microbiome, a network of microorganisms in the digestive tract that is linked to immune and metabolic function and may play a role in disease prevention and progression. While there isn't enough scientific evidence to show that keto wreaks havoc on the gut, it's important to be aware of potential gut microbiome changes when starting the diet.
To help prevent constipation on the keto diet, it's recommended to increase your intake of whole, high-fibre foods and ensure proper hydration. Adding a bit more salt to your food can also help retain water in the body and prevent dehydration and infrequent bowel movements. However, it's important to consult a doctor before making any dietary changes or taking supplements, as they can affect the body in different ways.
Some people on the keto diet may experience more pungent bowel movements, and others may find that a cup of coffee stimulates a bowel movement when they are constipated. While these are normal experiences, it's important to remember that everyone's body is different, and these experiences may vary from person to person.
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Bowel movements and hydration
Bowel movements are affected by a variety of factors, including activity level, age, illness, health conditions, medications, and diet. Any significant dietary change can cause changes in bowel movements, and the ketogenic (keto) diet is no exception. The keto diet is a very-low-carb, high-fat diet that can initially cause constipation or, less commonly, diarrhea. These side effects are due to the absence of carbs and an increased amount of fat, which the body may not be used to digesting properly.
Constipation refers to having three or fewer bowel movements per week, with stools that are hard and lumpy and difficult to pass. Diarrhea, on the other hand, is characterised by loose, watery stools and an increased frequency of bowel movements. While less common on the keto diet, diarrhea can be caused by lactose intolerance or a very high-fat intake.
To maintain regular bowel movements and prevent constipation while on the keto diet, proper hydration is crucial. The keto diet leads to increased fluid loss through urine, so drinking more water is essential to stay hydrated and keep bowels moving regularly. Additionally, consuming electrolytes like sodium and potassium can help prevent dehydration and maintain fluid balance in the body, further supporting regular bowel movements.
It is important to note that bowel habits may adjust over time as the body adapts to the keto diet. Increasing fibre intake and gradually introducing more fat can help regulate bowel movements. However, if constipation or diarrhea persists despite home remedies and treatments, it is advisable to consult a doctor or gastroenterologist for further guidance.
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Keto and pungent bowel movements
The ketogenic diet is a popular, low-carb, high-fat diet that can lead to weight loss. However, it can also cause changes in bowel movements, such as constipation or, less commonly, diarrhea. These changes are likely due to the absence of carbs and increased fat in the diet, which can be difficult for the body to adjust to.
While pungent bowel movements on the keto diet have not been extensively studied, some patients have reported this issue. It is important to note that any significant dietary change can affect bowel movements, and the keto diet is no exception. The high-fat content of the keto diet may be a contributing factor to pungent bowel movements, as it can be challenging for the body to digest large amounts of fat.
To help regulate bowel movements on the keto diet, it is recommended to increase your intake of whole, high-fibre foods and ensure adequate hydration. Electrolytes such as sodium and potassium are also important to include in your diet, as they can be lost in larger amounts while on keto. Additionally, some people find that increasing their magnesium intake helps with bowel issues, but it is advised to consult a doctor before taking supplements.
If pungent bowel movements persist or become a concern, it may be beneficial to consult a healthcare professional. They can provide guidance and recommendations tailored to your specific situation.
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Frequently asked questions
The keto diet can cause constipation and, less commonly, diarrhoea. Constipation is a frequent problem and can be caused by a lack of fibre and an increased amount of fat in the diet. Diarrhoea can be caused by lactose intolerance or a very high-fat intake.
You can prevent bowel issues by eating high-fibre foods, drinking plenty of water, and taking fibre supplements. You can also try adding flaxseeds, psyllium and wheat bran to your diet.
If you experience bowel issues, you should give your body time to adjust to the new diet. If issues persist, you should consult a doctor.











































