What food should not be eaten after surgery is usually related to the type of surgery, postoperative status, etc. and cannot be generalized. Usually in the early stage after surgery, patients are affected by anesthesia and need to wait until the anesthesia disappears and gastrointestinal function recovers before they can eat. Firstly, a small amount of liquid food should be given, and follow the principle of eating small amount of food several times, and only after there is no discomfort can the patient gradually transition to semi-liquid food, and then transition to general food. Postoperative diet should not eat spicy, stimulating food such as chili, pepper, mustard, etc.; should not eat too greasy food such as fried food, etc.; should not eat seafood such as crab, fish and shrimp, etc.; gastrointestinal surgery patients should not consume indigestible food, such as milk, soybean products, etc.; and do not take the patient allergic to the food. Patients with special diseases should not consume specific foods. For example, patients with thyroid cancer should not consume iodine-rich seaweed such as kelp and nori after surgery. It is suggested that the postoperative diet should be light and easy to digest, such as noodles, porridge, chicken, beef and other high-protein foods.