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Although there is no particular diet to follow, you can manage your irritable bowel syndrome (IBS) by limiting or eliminating foods that may bring on symptoms, particularly diarrhea. In general, you can change your diet based on whether your main symptom is constipation or diarrhea.

You also can keep a diary of what you eat and how it affects you. In addition, it helps to make sure that mealtimes are relaxing, which may prevent stress from bringing on symptoms.

Following a diet to reduce constipation

Taking the following steps may reduce your constipation:

  • Add fibre to your diet. Fibre will absorb water and add bulk to the large intestine, making bowel movements easier and more frequent than you usually experience. Eat high-fibre foods such as fresh fruits (raspberries, pears, apples), fresh vegetables (peas, brussels sprouts), wheat bran, whole-grain breads and cereals, and beans (such as kidney, pinto, and garbanzo). Increase the amount of fibre in your diet slowly to avoid excess gas.
  • Drink plenty of water. It is also important to drink 6 to 8 glasses of water daily, because fibre absorbs water. Water will keep stools soft.
  • Get regular exercise. Regular, gentle exercise such as walking, cycling, or swimming helps maintain bowel regularity.

If it is difficult to eat enough high-fibre foods, try using a non-prescription fibre supplement or bulking agent that contains crushed psyllium seed or methylcellulose. Examples include Prodiem and Metamucil. These products are different from laxatives because they do not irritate the lining of the intestine. They are safe for long-term use. To increase their effectiveness, take fibre supplements at the same time you eat. Although you may find the taste or texture unpleasant, most people get used to them over time, and the safety and effectiveness may be worth the inconvenience. Use laxatives (for example, milk of magnesia or bisacodyl—such as Dulcolax) only when recommended by your doctor.

Not all experts agree that eating more fibre will help reduce or prevent your symptoms of IBS. For some people who have IBS, eating more fibre may actually make some symptoms worse, such as bloating. Check with your doctor before increasing the amount of fibre in your diet. Add fibre gradually so your body can adjust to the change; if you do not, you may experience bloating.

Following a diet to reduce diarrhea

You may be able to reduce diarrhea if you limit or eliminate the following foods and beverages:

  • Alcohol
  • Caffeine, which is found in coffee, tea, cola drinks, and chocolate
  • Nicotine, from smoking or chewing tobacco
  • Gas-producing foods, such as beans, broccoli, cabbage, and apples
  • Dairy products that contain lactose (milk sugar), such as milk, cheese, and sour cream
  • Spicy foods, including salsas or many ethnic foods that use chile peppers
  • Foods high in acid, such as citrus fruit
  • Foods high in fat, including bacon, sausage, butter, oils, and anything deep-fried
  • Sorbitol and xylitol, artificial sweeteners found in some sugarless candies and chewing gum

You may try eliminating foods or beverages one at a time to see whether symptoms improve. If a specific food does not seem to be related to symptoms, there is no need to continue avoiding it.

You might want to consult a registered dietitian before eliminating foods from your diet. A dietitian can help you plan a diet to minimize symptoms while maintaining good nutrition.

If you have trouble digesting dairy products, you may have lactose intolerance, a condition that occurs when people have symptoms (such as gas, abdominal pain, and bloating) after consuming foods that contain lactose. If you avoid eating dairy products, be sure to get enough calcium from other sources, such as a calcium supplement or yogourt. Some of the lactose found in yogourt has already been digested by the yogourt cultures, so yogourt may not cause symptoms.

Keeping a food diary

Some people with IBS use a daily food diary to keep track of what they eat and whether they have any symptoms after eating certain foods. The diary also can be a good way to record what is going on in your life. Stress plays a role in IBS: if you are aware that particular stresses bring on symptoms, you can try to reduce those stresses.

Maintaining a pleasant mealtime environment

Try to maintain a pleasant environment when you eat. This may reduce stress that can make symptoms likely to occur. Give yourself plenty of time to eat, rather than eating on the go. Chew your food slowly. Try not to swallow air, which can cause bloating.

Test Your Knowledge

  1. Caffeine can trigger IBS symptoms.

    1. True
    2. False
  2. Increasing fibre in the diet does not improve symptoms of irritable bowel syndrome in everyone.

    1. True
    2. False

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Author: Carrie Henley
Robin Parks, MS
Last Updated: August 22, 2006
Medical Review: Kathleen Romito, MD - Family Medicine
Tom Bailey, MD - Family Medicine
Arvydas D. Vanagunas, MD - Gastroenterology

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