Tip - Minimize the use of caffeine-containing beverages such as coffee and caffeinated cola

Since caffeine can increase intestinal motility, people with IBS should avoid or minimize the use of caffeine-containing beverages such as coffee and caffeinated colas. Fructose or sorbitol (a sugar substitute) can induce diarrhea in some people. Since vitamin C supplements of 1 gram/day or more can cause diarrhea, patients with chronically loose stools should be advised to stop taking them.

Unnecessary delay in defecation should be avoided. When an urge is felt, leaving the stool in the colon may contribute to constipation because the longer the contents remain, the more fluid may be absorbed. Use of certain laxatives can perpetuate constipation because the large intestine can become dependent on them. People with IBS should not take strong laxatives.

Stephen Barrett, M.D.