Heather Zhou, RD, LD: When you're having ulcerations in your intestines or your colon, I think this is going to be some food that's going to be very painful to eat… Try a low residue, fiber-restricted diet. Meaning more of your refined grains, your white rice, your white pasta…everything I normally tell you to not do I usually emphasize… Residue is just that indigestible component or compound that's remaining in your digestive tract that your body does not break down. And you're going to find that in your celery and your tough fibrous fruits such as your pineapple… As well as your whole grain breads that have a lot of the nuts and seeds in it… Your soluble fiber are the fibers that are going to be easier to break down. So when you're having some cramping, abdominal distress then your soluble fiber such as oat meal, or apple sauce—no sugar added--yogurt… Some of these yogurts have fiber added to them. A low residue diet is generally about 10 grams of fiber. A high fiber diet is between 20 and 35 grams. So you want to slowly add the amount of fiber back into your diet and not experience some of the side-effects of cramping and abdominal distress.