Fructose, alcohol, caffeine, fried and fatty foods are all causes of diarrhea in patients with irritable bowel syndrome, according to WebMD. Additionally, foods containing dairy products may worsen the condition, particularly in individuals who are lactose intolerant.
Foods containing wheat may pose a problem, as many individuals have a glucose allergy or sensitivity, explains WebMD. The insoluble fiber found in some fruit skins and vegetables should be avoided or consumed in moderation. Additionally, carbonated beverages, large meals and sugar substitutes such as sorbitol are all contributors to IBS-related diarrhea.
Rich, fatty sauces and deserts can result in episodes of diarrhea, reports WebMD. Foods containing butter and heavy cream should be kept to a minimum or avoided altogether. Fructose used as a sweetener in certain foods, such as candy, fruit juice and pastries, has been known to cause diarrhea, cramping and bloating.
Those suffering from diarrhea should drink plenty of fluids to balance the dehydration caused by the condition, states WebMD. Spicy, fatty foods should be replaced with bland foods until symptoms ease. Eating a moderate amount of sources of soluble fiber, such as oats, barley and brown rice, helps add bulk to the colon. Foods that cause excessive gas, such as Brussels sprouts, cabbage and onions, should also be avoided as they may increase the discomfort of diarrhea.