Introduction

Pouchitis is the inflammation of the ileal pouch, an artificial rectum created after the total surgical removal of the colon and rectum. This surgery is often performed in patients with ulcerative colitis (UC) or familial adenomatous polyposis (FAP). Around 23-46% of people with ileal pouches experience pouchitis at some point.

The management of pouchitis is a challenge, but not impossible.¹ Antibiotics are the first line of treatment. Diet modifications have emerged as a complementary approach to managing symptoms, inflammation, and gut microbiota. Several of these approaches have shown promising results.²

This article covers the various ways in which pouchitis can be managed through diet.

Understanding pouchitis

Causes and triggers

Pouchitis can be acute (when symptoms last less than 4 weeks) or chronic (when symptoms last more than 4 weeks).³ The exact causal factors have not yet been determined, but certain risk factors have been identified. Acute cases are related to changes in the gut microbiome. Most progress to chronic cases, due to the interplay between various factors like advanced age, male gender, obesity, smoking, genetics, gut microbiome, surgical techniques, vitamin D deficiency, and inefficient immunity.¹

Symptoms of pouchitis

People with pouchitis present with various complaints that are not specific or unique to it.⁴ Some common symptoms are increased frequency and wateriness of stools, urgency, abdominal cramps, nightly leakage of stools, fever, and tenesmus.

The role of nutrition in pouchitis management

The treatment of pouchitis can present significant challenges, especially for patients who do not improve with antibiotics and other conventional treatments.

Nutrition plays an important complementary role in reducing symptoms and improving the quality of life in patients with pouchitis.⁵

General nutritional principles for pouchitis

The food you eat impacts gut mobility and microbiome. It may, in turn, affect the functioning of the ileal pouch or the formation of pouchitis.

Different foods impact how your pouch works by changing how quickly food moves through your digestive system, how much water is in your small intestine, and what types of bacteria grow in your pouch.⁵

FODMAPs (a type of carbohydrate) seem to affect pouch function the most. Eating more of these foods typically increases the frequency of using the loo and makes stool less solid.

The foods that help prevent pouchitis are sometimes different from foods that make your pouch work better day-to-day. For example, eating more fruits appears to lower your risk of getting pouchitis, even though these same foods might increase stool frequency.

It is not known exactly which parts of fruits provide this protection, but it might be because they contain:

• Fermentable fibre that feeds beneficial bacteria
• Nutrients that reduce inflammation
• Components that help increase the variety of good bacteria while reducing the harmful ones

Meals should be planned to include a variety of foods that are good for the gut and the desired functioning of the pouch.

Dietary approaches for pouchitis

Hydration

Staying well-hydrated is crucial for recovery and for the pouch to function as desired. You can add salt to your food or eat foods rich in potassium, such as bananas and potatoes, to ensure hydration.

In cases where pouchitis sets in, water and body fluids are lost through diarrhoea. It should be replaced at the earliest. However, take care not to overdo it. Ask your doctor/dietitian for the recommended amount.

Low FODMAP diet

FODMAPs are a type of carbohydrate found in some vegetables (like onions and garlic), some fruits (like apples and pears), wheat-based products (like bread and cereal), and dairy. They can cause bloating, gas, and loose motion when they ferment, more so in the pouch.

By reducing these foods, you can:⁶

• Decrease the frequency of stools
• Improve the consistency of stools
• Decrease gas and bloating

A low FODMAP diet does not treat the root cause of the inflammation but works to alleviate symptoms.

Mediterranean diet

The Mediterranean diet promotes healthy and balanced gut bacteria. It comprises

• Fruits and vegetables
• Whole grains
• Nuts and seeds
• Olive oil
• Fish
• Limited red meat

People who follow this way of eating have higher plant-based food components, fewer pouchitis flare-ups and more beneficial gut bacteria.⁵ These good bacteria help strengthen your gut lining and reduce inflammation.

Monash pouch diet (MPD)

The MPD was specifically developed for people with pouches by the scientists at Monash University.⁷ It follows five main principles:

• Eat 6-8 g of oligosaccharides (a type of carbohydrate found in certain vegetables, fruits, grains, and legumes) daily
• Cut down daily protein, especially sulphur-containing red meat, to 75-100g
• Avoid excess sugars, which pull water into your intestines
• Limit dairy products, as many patients are lactose intolerant
• Avoid food preservatives that disrupt gut bacteria

This approach addresses the triggers of the inflammation and helps restore balance to your gut bacteria.

Soluble fibre

A soluble fibre diet is a more gentle alternative to a high-fibre diet. During pouchitis flare-ups, high-fibre diets may worsen symptoms. But soluble fibre from certain foods can help, because it absorbs water and creates a gel-like substance that soothes the digestive system.

These foods include

• Fruits like apples, bananas, and pears
• Vegetables like carrots, sweet potatoes, broccoli, and cooked beets
• Psyllium husk and oats

This type of fibre is a prebiotic that feeds the beneficial bacteria that help fight inflammation.⁵ Moderate amounts of soluble fibre can help relieve symptoms of pouchitis without increasing stool frequency or aggravating irritation.

Fat and dairy use modifications

The type of fat you eat matters. Unhealthy saturated fats from fried or processed foods can worsen symptoms by increasing bile acid production and changing gut bacteria. Healthy fats like olive oil and omega-3s from fish have anti-inflammatory properties and don’t trigger symptoms.⁸

Similarly, many patients with pouchitis have trouble digesting lactose in dairy products. Switching to lactose-free alternatives, such as plant-based milks (e.g., almond or soy), can help reduce discomfort and maintain nutritional requirements.

Probiotics

Probiotics can restore the balance in the gut microbiome. After antibiotic treatment, which is the first line for pouchitis, the good bacteria are also eliminated. Probiotic supplements containing beneficial bacteria (like Lactobacillus and Bifidobacterium) can help prevent the recurrence of the inflammation. Probiotics,⁸ when used with dietary changes, can be highly beneficial.

Overcoming nutrient deficiencies

People with pouchitis often remove many nutritious foods from their diet to avoid triggering symptoms. Also, there could be malabsorption of nutrients due to the inflammation. This can cause vitamin and mineral deficiencies, which lead to fatigue, anaemia, and other problems. Your doctor/dietitian might recommend supplements like vitamin D and B12, calcium, and iron, along with electrolytes to ensure you're not missing out on any nutrients.

Practical tips for changing your diet

Food triggers vary from person to person. Keep a food diary to identify which foods irritate. This avoids unnecessary elimination of foods that your gut is used to.

Strict diets, such as low FODMAP or Monash pouch diet, can provide relief, but shouldn't be followed without professional guidance. Because they might lead to nutrient deficiencies or further disrupt your gut bacteria.

Changing how you eat requires careful planning to ensure you get symptom relief without missing important nutrients. You will need a personalised dietary plan.⁹ Always consult with your doctor and dietitian before starting a new diet. After the symptoms reduce, they can help you gradually reintroduce foods that had to be eliminated.

Summary

Pouchitis is the inflammation of the ileal pouch, an artificial rectum created after the total surgical removal of the colon and rectum. One-fourth to almost half of the world’s population experiences pouchitis.

Modifications to your diet can be a very helpful addition to medical treatments for pouchitis. Approaches like the low FODMAP diet, Mediterranean diet, Monash pouch diet, soluble fibre, healthy fats, and probiotics result in different benefits depending on your particular situation.

Working with healthcare professionals to develop a personalised plan can help improve your symptoms while ensuring you get balanced nutrition. Combining diet-based approaches with mainstream treatments holds great promise for improving the quality of life for people with pouchitis.