How to adjust the diet for oncology patients who have diarrhea especially during radiotherapy? Diarrhea during radiotherapy is usually caused by radiation enteritis. Radiation enteritis is a complication of intestine caused by radiation therapy for pelvic, abdominal and retroperitoneal malignancies, which can involve small intestine, colon and rectum respectively, so it is also called radioactive proctitis, colitis and small intestine. In the early stage, intestinal mucosal cell renewal is inhibited, resulting in intestine, intestinal mucosal atrophy, thinning of villi, intestinal mucosal edema, increased intestinal mucosal permeability, dysbiosis, and decreased absorption function or even loss. How to adjust the diet of radioactive enteritis once it occurs? ① Eat more of the following vegetables: such as cabbage, banana, potatoes, cauliflower, broccoli, mushrooms, etc.; ② Glutamine is an essential nutrient for intestinal mucosal cell metabolism and plays a very important role in maintaining the integrity of intestinal mucosal epithelial structure and the function of intestinal mucosal barrier. Fresh cabbage juice and animal liver are rich in glutamine that promotes the growth of mucin-producing cells, which is beneficial to the protection of the gastrointestinal mucosa; ③ food at the right temperature is best for people with enteritis, chew slowly when eating, which can reduce the burden of intestinal digestion and absorption; do not eat cold food, cold food can cause gastrointestinal discomfort, such as mainly including bitter melon, tomatoes, water chestnuts, lilies, lotus root ④ Take milk and yogurt containing intestinal probiotics regularly, which are beneficial to the growth of normal intestinal flora, thus protecting the intestinal mucosal barrier and strengthening the intestinal mucosal ⑤ Avoid eating foods that are too hard, too hot, too cold, too spicy, too sticky, fried and pickled, and try to eat less or no stimulating foods such as onions and leeks.