I think what you may be experiencing is irritable bowel syndrome. Alot of people think this means your bowel movements are not regular, etc which is not the case. Hear me out....
With IBS, the nerves and muscles in the bowel are extra-sensitive. For example, the muscles may contract too much when you eat. Or the nerves can be overly sensitive to the stretching of the bowel (because of gas, for example). Cramping or pain can result.
Here are some foods that may cause symptoms:
fatty foods like french fries
milk products like cheese or ice cream
chocolate
alcohol
caffeine (found in coffee and some sodas)
carbonated drinks like soda
Large meals can cause cramping and diarrhea in people with IBS. If this happens to you, try eating four or five small meals a day. Or, have your usual three meals, but eat less at each meal.
Good luck!