Diverticulitis Diet: When to Eat A High or Low Fiber Diet for Diverticular Disease

May 9, 2025

At the Alabama Rectal and Colon Institute, there are many things we look for when performing routine colonoscopies, and one of the things we may find are diverticula. These are small, bulging pouches that can form in the lining of your digestive system. Your diagnosis will be diverticulosis when diverticula are present, but you have no associated problems. This form of diverticular disease can exist without you even knowing about it. It is essential to manage your fiber intake to avoid constipation during this time.

However, when diverticula become inflamed or infected, it can cause symptoms such as abdominal cramping, pain, tenderness, swelling, bloating, constipation, or diarrhea. This is called diverticulitis.

Maintaining healthy bowel movements is crucial in managing diverticulitis and preventing future incidents. With each of these conditions, there are specific foods to eat and avoid as part of the treatment plan.

Introduction to Diverticular Disease Management

Diverticular disease is a condition where small, bulging pouches (diverticula) form in the wall of the large intestine. Managing diverticular disease requires a comprehensive approach that includes dietary changes, lifestyle modifications, and medical treatment. A high fiber diet is essential for preventing diverticulitis flare-ups and promoting overall gut health. Eating high fiber foods, such as whole grains, fruits, and vegetables, can help soften stool and reduce pressure on the diverticula. A low fiber diet, on the other hand, may exacerbate symptoms and increase the risk of complications. Working with a healthcare provider to develop a personalized eating plan that considers individual needs and health status is crucial.

Recommended Diet for Diverticulosis

The American Society of Colon and Rectal Surgeons (ASCRS) says that the exact cause of diverticulosis is unclear, but we know it’s a common condition. The most widely accepted theory is that low fiber in the diet can cause stool to become relatively dry, forcing the colon to create high pressure to move the stool. This high pressure can cause the weakest point of the colon wall to bulge out. Certain foods can aggravate symptoms, and it is essential to identify personal food triggers through trial and error to manage symptoms more effectively.

A fiber-rich diet can help keep stools soft and prevent inflammation for someone with diverticulosis (but not yet diverticulitis). A high-fiber diet gives bulk to the stool, allowing it to pass quickly and easily. This helps prevent constipation and decreases pressure in the colon, which can help prevent diverticulitis from developing. A high-fiber diet reduces the risk of developing diverticulitis by promoting healthy bowel movements and mitigating inflammation.

High-fiber foods include:

• Beans and legumes

• Bran, whole wheat bread, and whole grain cereals such as oatmeal

• Brown and wild rice

• Fruits such as apples, bananas, and pears

• Vegetables such as broccoli, carrots, corn, and squash

• Whole wheat pasta

If your diet is not high in fiber, gradually add fiber. This helps avoid bloating and abdominal discomfort. The target is to eat 25 to 35 grams of fiber and drink at least eight cups of fluid daily to help soften your stool. Exercise also promotes bowel movement and helps prevent constipation.

Recommended Diet for Diverticulitis

When diverticulitis develops, it is often painful and persistent. Symptoms may include nausea and vomiting, fever, abdominal tenderness, constipation, or, less commonly, diarrhea. To provide bland and easily digestible foods during diverticulitis flare-ups, the BRAT diet, which includes bananas, rice, applesauce, and toast, is often recommended.

Mild cases of diverticulitis are usually treated with antibiotics and a low-fiber diet. Treatment may start with a period of rest during which you eat nothing, move to clear liquids, and then begin a low-fiber diet until your condition improves. Drinking plenty of liquids during recovery is essential for staying hydrated.

Dietary changes can help the colon heal. Examples of items allowed on a clear liquid diet include:

• Broth

• Fruit juices without pulp, such as apple juice

• Ice chips

• Popsicles without bits of fruit or pulp

• Gelatin

• Water

• Tea or coffee without cream

• Ice pops

As you start feeling better, we may recommend that you slowly add low-fiber foods, such as:

• Canned or cooked fruits without skin or seeds

• Canned or cooked vegetables such as green beans, carrots, and potatoes (without the skin)

• Eggs, fish, and poultry

• Refined white bread

• Fruit and vegetable juice with no pulp

• Low-fiber cereals

• Milk, yogurt, and cheese

• Cottage cheese

• White rice, pasta, and noodles

If lactose-intolerant, consult healthcare professionals for alternatives or lactose-free options.

You should feel better within two or three days of changing your diet and taking antibiotics. Continuing a clear liquid diet for over a few days can lead to weakness and other complications since it doesn’t provide enough nutrients your body needs. Transitioning back to a regular diet as soon as you can tolerate it is essential. Fiber supplements can play a role in recovery and prevention by softening stool and preventing constipation. A low-FODMAP diet can also help manage symptoms by reducing fermentable carbohydrates. Adding more fiber to your diet after recovery is crucial to avoid future flare-ups. Preventing future attacks and flare-ups through dietary choices is essential for long-term management. Reintroducing solid food gradually during recovery is important to avoid straining the intestines. Managing stomach pain through dietary adjustments can also help alleviate symptoms.

Transitional Diet

A transitional diet is a temporary diet that helps the digestive system recover from a diverticulitis flare-up. During this phase, it is recommended to choose low fiber foods that are easy to digest, such as clear liquids, low fiber grains, and cooked vegetables. A clear liquid diet may be necessary for a short period, usually 1-2 days, to rest the digestive system. After that, solid foods can be gradually introduced, starting with low fiber options like white bread, rice, and applesauce. During this phase, it is essential to avoid high fiber foods, such as nuts, seeds, and legumes, as they can irritate the digestive tract and worsen symptoms. A low fiber diet limits fiber intake to 8-12 grams per day, depending on the severity of the flare-up.

Foods to Eat and Avoid

When managing diverticular disease, knowing which foods to eat and avoid is crucial. High fiber foods, such as whole grains, fruits, and vegetables, are essential for preventing diverticulitis flare-ups and promoting overall gut health. Low fiber foods, such as white bread, rice, and applesauce, can be helpful during a diverticulitis flare-up, as they are easy to digest and help reduce symptoms. However, it is essential to avoid trigger foods that can exacerbate symptoms, such as spicy or fatty foods, and to limit or avoid processed foods, red meat, and dairy products if they cause discomfort. A well-balanced diet that includes a variety of whole foods can help prevent diverticulitis flare-ups and promote overall health.

Creating a Personalized Eating Plan

Creating a personalized eating plan is essential for managing diverticular disease. A healthcare provider can help develop a tailored diet that considers individual needs, health status, and lifestyle. The plan should balance high fiber foods, such as whole grains, fruits, and vegetables, and low fiber foods, such as white bread, rice, and applesauce. It is also essential to identify trigger foods that can exacerbate symptoms and to develop strategies for managing them. A food diary can be a helpful tool for tracking food intake and symptoms, and for identifying patterns and correlations. By working with a healthcare provider and making informed dietary choices, individuals with diverticular disease can reduce their risk of diverticulitis flare-ups and promote overall health.

Make Colorectal Screening a Priority at Alabama Colon & Rectal Institute

Colonoscopies can screen for colorectal cancer and diverticular disease. A high-fiber diet can help manage diverticulosis, in which diverticula are present but not causing problems. If diverticulitis does occur, we recommend a low-fiber diet to help your colon rest and heal. See our doctors for help with either of these conditions!

Alabama Colon & Rectal Institute specializes in treating diseases of the colon, rectum, and anus. We are  experts in performing colonoscopies, anorectal surgery, and minimally invasive colon surgery. Our three doctors are known regionally for their expertise in these areas. Visit our website for more information, give us a call to make an appointment at 205-458-5000, or email us at [email protected].