If you're in a flare, you need to be on a liquid diet. If it is resolving, you should be on easily digestible foods like scrambled eggs, soup (low in fiber), well cooked vegetables only like carrots, white bread, pancakes, corn flakes, very low fiber food that the body doesn't have to work too hard to metabolize. Add things very slowly. Beans are absolutely out of the questions as is any high fiber food. As your body recovers, you can add fibrous foods but do so very carefully, one at a time over a few days between foods. If you encounter any problem, such as increased pain or signs of constipation, go backward in your diet to a blander diet or even to a liquid diet for one day. It's not unusual for the bowel to be more tender for a while as it takes time for it to heal. So occasional gas pain in that spot is normal but always check with your gastroenterologist. And drink a lot of water within reasonable limits.