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Keto and Ulcerative Colitis: A Mixed Picture

19 October 2026 · Keto Health Conditions · 3 min read

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Ulcerative colitis is a chronic inflammatory bowel disease (IBD) that affects the large intestine. The ketogenic diet, a high-fat, very-low-carbohydrate eating plan, has garnered attention for its potential anti-inflammatory effects. However, the relationship between a ketogenic diet and ulcerative colitis is complex and not fully understood.

What is Ulcerative Colitis?

Ulcerative colitis (UC) causes inflammation and ulcers in the lining of the colon and rectum. Symptoms can include abdominal pain, diarrhoea, rectal bleeding, and weight loss. The exact cause of UC is unknown, but it’s believed to involve a combination of genetic predisposition, immune system dysfunction, and environmental factors. Treatment typically involves medication to reduce inflammation and manage symptoms. Some people explore dietary changes as complementary strategies. It’s important to discuss any dietary changes with your gastroenterologist or a registered dietitian before making significant changes.

The Potential Benefits of Keto

The ketogenic diet may offer some potential benefits for individuals with ulcerative colitis due to its anti-inflammatory properties. When carbohydrate intake is severely restricted, the body enters a metabolic state called ketosis, where it starts burning fat for fuel and producing ketones. Ketones have been shown to have anti-inflammatory effects, which could potentially help reduce inflammation in the gut. the role of short-chain fatty acids is also a factor.

The Potential Risks and Drawbacks

Despite the potential benefits, there are also risks associated with following a ketogenic diet if you have ulcerative colitis. The high fat content of the diet may worsen diarrhoea in some individuals. Additionally, restricting carbohydrates can limit intake of certain types of fibre, which are important for gut health and can help to regulate bowel movements. It’s also worth noting that the long-term effects of a ketogenic diet on gut health are still not fully known. Close monitoring is essential, and any adverse effects should be promptly addressed with your healthcare provider.

What this means in practice

Navigating dietary changes with ulcerative colitis requires careful consideration. If you’re considering a ketogenic diet, start by consulting with a registered dietitian or nutritionist who specialises in IBD. They can help you develop a personalised meal plan that meets your nutritional needs while minimising potential risks. For example, they might recommend focusing on easily digestible fats like avocado oil and coconut oil, while limiting harder-to-digest fats like those found in processed foods. You can find avocados for around £1 each at most Tesco stores. Remember, what works for one person may not work for another, so individualised guidance is key. the specific keto macro percentages should be tailored to your needs.

Frequently asked questions

Can a ketogenic diet cure ulcerative colitis?

No, a ketogenic diet cannot cure ulcerative colitis. It may help manage symptoms in some individuals due to its anti-inflammatory properties, but it is not a replacement for conventional medical treatment.

Is a ketogenic diet safe for everyone with ulcerative colitis?

A ketogenic diet is not safe for everyone with ulcerative colitis. It’s essential to consult with your gastroenterologist and a registered dietitian to determine if it’s appropriate for you, considering your individual medical history and symptoms.

What are the potential side effects of a ketogenic diet for ulcerative colitis?

Potential side effects can include diarrhoea, constipation, nutrient deficiencies, and an imbalance in gut bacteria. Close monitoring and careful meal planning are essential to minimise these risks.

The bottom line

The evidence surrounding ketogenic diets and ulcerative colitis is still emerging. While some individuals may experience symptom relief due to the diet’s anti-inflammatory effects, others may find that it worsens their symptoms. A ketogenic diet should only be considered under the guidance of a healthcare professional who can help you weigh the potential benefits and risks and monitor your progress closely. If you’d rather not do the macro maths yourself, the automatic macro calculator in the Keto Dieting app does it for you on Google Play and the App Store.

Educational only — not medical advice. This article is for general information. Speak to your GP before changing your diet, especially if you have type 1 or type 2 diabetes, kidney or liver disease, are pregnant or breastfeeding, or take medication for blood pressure, cholesterol, or blood glucose.

References

  1. Paoli A, Rubini A, Volek JS, Grimaldi KA (2013). Beyond weight loss: a review of the therapeutic uses of very-low-carbohydrate (ketogenic) diets. European Journal of Clinical Nutrition. https://doi.org/10.1038/ejcn.2013.116
  2. Sumithran P, Prendergast LA, Delbridge E, et al. (2013). Ketosis and appetite-mediating nutrients and hormones after weight loss. European Journal of Clinical Nutrition. https://doi.org/10.1038/ejcn.2013.90

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