Dietary principles during acute attack of ulcerative colitis include light, easy to digest, and adequate nutrition. 1. Light diet: the purpose of light diet is to reduce the stimulation of food on the intestinal mucosa, because ulcerative colitis in the acute attack of intestinal mucosa is in a state of congestion, edema and even bleeding, spicy and stimulating food will aggravate the inflammatory reaction of the intestinal mucosa. 2. Easy to digest: easy to digest food is not easy to accelerate intestinal peristalsis, at the same time stimulate the reaction of defecation is weaker, so that the inflammatory attack of the intestinal mucosa have more time to repair, if you eat high fiber content of indigestible food will aggravate the burden on the intestinal mucosa, and may even increase the risk of intestinal mucosal bleeding. 3. Nutritional adequacy: nutritional adequacy refers to the need to increase the intake of food rich in iron, high quality protein, B vitamins and other hematopoietic raw materials, so as to improve the anemia caused by intestinal blood loss during the acute exacerbation of ulcerative colitis. In addition to diet needs attention, ulcerative colitis acute attack is the most critical to timely medical treatment, standardized full course of medication or surgical treatment.