There is no universal diet (and some people are not diet triggered so which food doesn't matter).The general "rules" tend to be (esp for diarrhea prone types) areAvoid greasy/fried/fatty foods.Limit starchy foods other than rice.Watch fruits for high sorbitol fruits (cooked version are OK) so apples, pears, plums, peaches, cherries, apricots, nectarines.Avoid caffiene and alcohol.Now if you tend to constipation adding fruits with sorbitol may loosen the stools, but can increase gas...so it varies.If you have pain shortly after meals most of the time it may be (like me) that you over-respond to the "hey food's on it's way" signal that the stomach sends to the GI tract whenever you eat.For that smaller volumes sometimes helps.Taking an antispasmodic or taking some peppermint (Tea, Altoids Herbal capsules)20-30 minutes before meals can help calm that down.Antidepressants can also help calm that pain down.The most effective approach for me was a course of Cog. Behav. Therapy that was designed for IBSers. (did it isn 1998 and most of the pain is gone most of the time).K.