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Which Foods Should You Avoid with Ulcerative Colitis?


Ulcerative colitis (UC) is a chronic, inflammatory disease of the colon and rectum. It’s one of two main inflammatory bowel diseases, the other being Crohn’s disease.

When a person has UC, sores called ulcers develop inside the colon.

Symptoms of the disease include:

  • abdominal pain
  • blood or pus in the stool
  • diarrhea
  • nausea
  • rectal bleeding
  • fatigue
  • weight loss

Researchers don’t know for sure what causes UC, but they think it may be caused by a misdirected immune reaction. Numerous things may trigger a flare, including certain foods.

During a flare-up of symptoms, a low-fiber diet may be helpful in reducing material in the colon, and thereby reducing symptoms. If your doctor has prescribed a low-fiber diet for your symptoms, follow the recommendations below.

Whole grain breads, cereals, and pastas

Foods that contain lots of fiber tend to be difficult for people with UC to digest. Whole grain flour is high in fiber because it hasn’t had the germ or bran removed.

You should avoid eating food made from any whole grain flour, such as:

  • breads
  • cereals
  • pastas
  • noodles
  • macaroni

During flare-ups, choose white breads and pastas made from enriched white flour. Flour is “enriched” when nutrients lost during the germ and bran removal process are replaced. Cereals like puffed rice, corn flakes, and cream of wheat are also low in fiber.

Brown rice and other whole grain starches

You should avoid the following whole grain foods:

  • brown rice
  • quinoa
  • buckwheat
  • oats
  • wild rice 

These grains still have the fibrous endosperm, germ, and bran that can irritate UC and trigger a flare-up.

You should avoid these other whole grains:

  • plain barley
  • millet
  • wheat-berries
  • bulgur wheat
  • spelt 

A better option for those with UC is well-cooked white rice.


Nuts, including those cooked into other foods or made into flours, should be on your do-not-eat list if you have UC. The fiber in them is very hard to digest.

It’s best to avoid the following nuts:

  • walnuts
  • hazelnuts
  • pecans
  • cashews
  • almonds
  • macadamia nuts
  • peanuts
  • pistachios 


Like nuts, seeds can also aggravate symptoms. Seeds are a type of insoluble fiber, which can cause bloating, diarrhea, gas, and other irritating side effects.

Some seeds to avoid include:

  • sesame seeds
  • flax seeds
  • millet
  • pine nuts
  • sunflower seeds
  • pumpkin seeds
  • wild rice

Dried peas, beans, and lentils

Legumes, including beans, lentils and peas, are high-fiber, high-protein foods. Because of the indigestible sugars in beans, they’re also notorious for causing gas. If you have UC, you’ll want to pass on the following:

  • all beans, including chickpeas
  • adzuki beans
  • soy nuts, including soybeans and edamame

Fibrous fruits

While they are healthy for you, most fruits contain a lot of fiber. They belong on the avoid list if they are:

  • raw
  • dried
  • have seeds that can’t be removed (like most berries)

You can eat fruit that’s been peeled and the flesh cooked until very soft, such as applesauce. You can also eat canned fruits, but choose the type packed in water or in their own juice to avoid excess sugar. Most fruit juices are fine to drink, but only with the pulp removed. Skip prune juice since it’s very high in fiber.

Fibrous vegetables

Like fruits, vegetables are also full of fiber. Include them in your diet only if they are:

  • skinned or peeled
  • have no seeds
  • are cooked until soft 

Avoid all raw or undercooked vegetables, including corn. It’s fine to consume canned vegetables and potatoes, as long as the skin has been discarded. Try pureed vegetable soups for an easy way to digest vegetables. Vegetables provide many important nutrients and it’s important to incorporate them in your diet. 

Dairy products

 A common food intolerance among those with UC is dairy. If you suspect dairy may be a symptom trigger for you, remove all types of dairy including butter, milk, yogurt, and cheese for at least three weeks. Many resources are available to help you learn how to follow an elimination diet, especially when you work closely with your doctor and dietitian.

Foods to enjoy

While your diet may be restricted if you have UC, especially if you’re having a flare-up, it doesn’t have to be boring. Focus on the foods that you can eat rather than the foods you should avoid. The foods you can eat include:

  • white bread without seeds
  • white pasta, noodles, and macaroni
  • white rice
  • crackers and cereals made with refined white flour
  • canned, cooked fruits
  • cooked vegetables without skins or seeds
  • pureed vegetable soups
  • tender, soft meats (no gristle or skin), fish, and eggs
  • peanut and other nut butters
  • oils like olive oil and coconut oil

It’s key to remember that your diet plays a vital role in your overall health. Use this information as a guide to help keep your diet healthy and on track.