During immunotherapy, it is recommended to avoid excessive single diet, avoid not eating vegetables and high protein food, etc. 1. Avoid excessive single diet: During the treatment period, a single diet will lead to a single source of intestinal microecology, eating only a few foods may lead to intestinal microecological agents, dietary diversification to enhance the body’s immune system and improve the intestinal microecological environment. 2. Avoid not eating vegetables: eating a diet rich in dietary fiber is conducive to the intestinal microbiota, it is recommended that patients pay attention to avoid not eating vegetables, eat more vegetables and fruits as appropriate, which can increase the plant fiber, pay attention to coarse and fine collocation. 3. Avoid not eating high protein food: pay attention to eat more high protein food, can enhance the body’s nutrition, increase the body’s resistance, it is recommended to eat more fish, shrimp, meat and egg food. 4. Avoid spicy and stimulating food, such as hot pot. 5. Avoid high-fat, low-fiber foods, such as red meat. During the immunotherapy period, it is recommended that patients can consult the relevant departments of regular hospitals, pay attention to the observation of the side effects of the drugs, and do not take medication on their own.