I have heard that when you eat something it triggers the colon to excrete liquid which move the bowel basically because of the inflammation in the colon..I believe the key is to get the inflammation to stay away...that requires a diet to cater to the colitis...my gastro doctor recommended the following...avoid these foods...sometimes it works but it is hard to tell which is which...I am constantly trying to figure it out...this is a horrible disease. nuts, fatty and fried food, grapes, apples, cherries, chocolate, beans, caffeine. hope this helps. do not eat at greasy food places...it will set it right off. I find it is very difficult to eat out.