[1] Foods don’t cause ulcerative colitis (UC) , but they do have the potential to trigger symptoms. You probably know this all too well: After you eat certain foods, they may set off uncomfortable symptoms like diarrhea, cramping, and pain. Modifying your diet can help prevent painful symptoms, but it may be difficult when autumn specialties roll in with the crisp fall air. Here are five fall swaps to make if you have UC, particularly during flares or when certain foods are causing symptoms. [8] Instead, Kennedy suggests having pretzels made with white flour.