12 Foods to Avoid with Diverticulitis

2. Cabbage

Cabbage often causes trouble during a diverticulitis flare. You may notice more belly pain, pressure, or bloating after eating it. This reaction happens more often when your gut feels inflamed.

Cabbage contains a lot of fiber and natural sugars that break down slowly. When your bowel feels irritated, these parts can raise gas and stretch the bowel wall. That pressure can make symptoms feel worse, even in small amounts.

Raw cabbage tends to cause more problems than cooked cabbage. Raw leaves stay firm and take longer to digest. Cooking softens the fibers, but the food can still trigger gas for some people during active symptoms.

Cabbage also belongs to a group of vegetables known for gas buildup. This effect does not mean cabbage causes the disease. It means your gut may not handle it well when it feels sensitive. Cabbage fits the pattern of foods that create bulk and gas, which often feel harder to tolerate during flares. As symptoms calm, tolerance can change. Your response may depend on portion size, cooking method, and how your gut feels that day.

3. Corn

Corn often causes trouble during a diverticulitis flare. You may have a hard time breaking it down, especially the outer skin. When pieces pass through your colon, they can raise irritation in sore areas. Whole corn, popcorn, and corn on the cob tend to be the biggest problems. The small, firm bits can move through your gut without fully softening. That texture can add pressure where your bowel already feels tender.

During a flare, many care plans focus on giving your colon a rest. Lower fiber foods digest more easily and create less bulk. Corn sits on the higher fiber side, so it can slow healing when symptoms stay active. You may also notice more gas and bloating after eating corn. That extra pressure can increase pain or cramping. If your belly already feels tight or sore, this reaction can make daily comfort harder.

4. Peppers

Peppers can cause problems during a diverticulitis flare. Their firm skin and small seeds can irritate your gut when it is inflamed. This can raise discomfort and slow healing. Bell peppers, chili peppers, and sweet peppers all share similar traits. Your body may struggle to break down the outer skin during a flare. This can lead to cramping, bloating, or sharp pain in the lower belly.

Spicy peppers add another concern. Capsaicin, the compound that makes peppers hot, can irritate the lining of your digestive tract. When your colon is already sore, this irritation can worsen pain and increase bowel changes.

Cooked peppers may seem softer, but the skin often stays tough. Even small pieces can cause symptoms during active inflammation. Roasted or blended peppers can still trigger discomfort for some people.

5. Broccoli

You may need to avoid broccoli during a diverticulitis flare. Broccoli contains a high amount of fiber, especially when eaten raw or lightly cooked. During a flare, your colon feels irritated and needs foods that are easy to digest.

Broccoli also produces gas as it breaks down in your gut. This gas can increase pressure in the colon. You may notice more bloating, cramps, or sharp pain after eating it.

The thick stalks and small buds can be hard to chew and break down. When digestion slows, stool can become bulky. This can worsen discomfort when your colon is inflamed. Even well-cooked broccoli may still cause symptoms for you. Soft foods with less fiber often feel better until pain and swelling settle down. After your symptoms improve, you may tolerate broccoli again. Many people eat it without trouble when they are not in a flare.

6. Fatty Foods

Fatty foods can make diverticulitis symptoms harder to manage. You may notice more pain, bloating, or changes in bowel habits after eating them. These foods slow digestion and can increase pressure inside your colon.

When your gut already feels irritated, this added strain can worsen discomfort. Fat also takes longer to break down, which may lead to constipation for some people. During a flare, your digestive system works best with simple, easy-to-digest foods. High-fat meals often feel heavy and can trigger cramps or nausea.

Common examples of high‑fat foods include fried items such as fries, fried chicken, and doughnuts, as well as fast food meals that contain greasy sauces. Fatty cuts of red meat like bacon or sausage, full‑fat dairy products such as cream, butter, and certain cheeses, and baked goods made with large amounts of oil or shortening also fall into this group.

7. Lentils

Lentils often appear on healthy food lists because they contain a lot of fiber. For diverticulitis, that same fiber can cause problems during a flare. Your gut may struggle to handle it when the bowel feels swollen or irritated.

Lentils add bulk to stool and increase gas. This change can raise pressure inside your colon. You may notice more pain, bloating, or cramping soon after eating them. Many lentils keep their shape after cooking. Your body does not fully break them down, especially when digestion slows. Small pieces can move through the colon and worsen discomfort in sensitive areas.

Common lentil dishes also mix in onions, garlic, or spices. These ingredients can irritate your gut even more. The combination can increase symptoms faster than lentils alone. You may also notice loose stools after eating lentils. Their fiber pulls water into the bowel. This effect can add urgency and make daily symptoms harder to manage.

8. Beans

Beans often cause trouble during a diverticulitis flare. They contain a lot of fiber, which can stress your colon when it feels sore or swollen. During this time, your gut needs rest, not extra bulk.

Many beans also create gas as they break down. Gas can raise pressure inside your colon and make pain, bloating, or cramping worse. This reaction can happen even if you usually digest beans well.

Common beans that may cause problems include black beans, kidney beans, chickpeas, lentils, baked beans, and split peas. These foods also have firm skins that take longer to digest. That slow digestion can irritate your gut during active symptoms.

You may notice loose stools or sharp pain after eating beans during a flare. These signs suggest your colon struggles to handle high-fiber foods right now. After symptoms calm, beans may become easier to tolerate again. Small portions can be tested over time, and a return of gas or pain often signals that more time is needed before trying again.

9. Red Meat

Red meat includes beef, pork, lamb, and foods made from them. Many meals use red meat as a main protein source, but during diverticulitis, this type of food can strain your digestive system. Red meat is harder for your body to break down than many other proteins, so digestion takes longer and increases pressure inside the colon. This can worsen pain and bloating when your colon already has inflamed pouches.

Diets high in red meat often contain less fiber, which can lead to constipation and slower bowel movement. These changes can raise the chance of irritation in the colon during a flare. Some research links frequent red meat intake with a higher risk of diverticular disease, showing that heavy intake often appears alongside more symptoms. Processed red meats may cause more problems than fresh cuts. These foods often contain added fat and salt. Examples include sausage, bacon, hot dogs, and deli meats.

10. Brussels Sprouts

Brussels sprouts often cause trouble during diverticulitis flares. You may feel more pain, pressure, or bloating after eating them. These vegetables contain a lot of fiber, which supports gut health when you feel well, but can irritate your bowel during active inflammation.

Brussels sprouts also increase gas. As your gut breaks them down, bacteria create gas that stretches the bowel and raises cramping, which makes abdominal pain feel stronger. Brussels sprouts keep a firm structure even after cooking, so you may find them harder to digest than softer foods, especially when your bowel lining feels sensitive.

During diverticulitis, many people tolerate low-fiber foods better because these foods pass through the bowel with less effort. Brussels sprouts do the opposite because they add bulk and slow digestion. You may also notice changes in bowel habits after eating them. Some people feel more urgency, while others feel blocked. Both reactions can add stress to an already inflamed colon.

11. Whole Grains

Whole grains are made from the full grain and contain large amounts of fiber. This fiber adds bulk to stool and can stress the bowel during a diverticulitis flare. Whole grains can feel rough as they move through the gut and may increase pain, bloating, or cramping while the digestive tract recovers.

Whole grain foods that often cause trouble during a flare include whole wheat or whole rye bread, brown rice, and wild rice. Bran flakes, shredded wheat cereal, oatmeal made with intact grains, and foods with added wheat bran can also be difficult to tolerate.

Outside of flare-ups, many people tolerate whole grains without problems. Some people even eat them daily with no pain. Your response can vary based on how active the condition is. During flare periods, whole grains often worsen discomfort because of their fiber load. When symptoms calm down, your body may handle these foods better.

12. Carbonated Beverages

Carbonated beverages can irritate your gut during a diverticulitis flare. The bubbles release gas in your digestive tract. This raises pressure and causes pain, bloating, or cramping. Many carbonated drinks also contain sugar or caffeine, which can speed up bowel movement or pull water into the gut and lead to loose stools or discomfort when your digestive system needs rest.

Common carbonated drinks that often cause problems include regular and diet soda, sparkling water or seltzer, energy drinks, and carbonated fruit drinks. During an active flare, you often tolerate still liquids better. Plain water, diluted juice, or clear broths keep you hydrated without adding gas.

After symptoms ease, some people can handle small amounts of carbonation. If you notice pressure, gurgling, or pain after drinking it, your gut may still react to bubbles. Your tolerance can vary from one flare to another. Paying attention to how your body responds helps you decide when to avoid carbonated drinks and when to wait longer before trying them again.