In the process of comprehensive treatment of tumor, food therapy is one of the important ways and means, but there are often some misunderstandings in life. The treatment of tumor is a complex and long process. In the absence of special means for its prevention and treatment, food therapy, pharmacotherapy and other therapies such as surgery are all important parts of the comprehensive treatment of tumor, and one cannot be missing without the other. Many foods in dietary therapy are part of medicine and have certain curative effect, but they cannot completely replace medicine, let alone replace the conventional treatment of tumor such as pharmacotherapy, but should be actively carried out on the basis of improving body constitution and immunity with the help of dietary therapy. In addition to killing tumor cells, various treatment means will also damage the normal cells of the body and lead to the loss of positive energy, if the diet is not strengthened, it will eventually lead to the collapse of positive energy and lose the opportunity of treatment. 2.Reasonable avoidance of food Avoidance of food refers to the avoidance of certain food during the disease, which is the main component of food therapy and has important significance for the treatment and recovery of tumor patients. However, there are often misunderstandings in clinical patients’ taboos: some people think that “all meat such as chicken, duck and fish should be strictly forbidden, and only vegetarian food should be eaten to starve tumor cells to death”, as a result, patients are getting thinner and thinner after the taboos, and their physique is not as good as every day, and they cannot carry out any active treatment for tumor; some people think that there is no need for taboos, and everything can be eaten to “strengthen the body”. As a result, they eat a lot of meat food, which causes indigestion and diarrhea and even accelerates the recurrence of tumor. There is no definite conclusion on whether the “hairy food” mentioned in Chinese medicine, including chicken, fish, shrimp and many meats, can cause tumor recurrence, but these foods are important sources of protein and other vital substances for human body. Therefore, it is generally believed that avoidance of food should be scientific and reasonable, depending on the time (season), disease and person, such as not eating more warm and dry food in summer, and avoiding cold food in winter; the diet for digestive tract tumor should be light, and lung cancer patients should avoid dry and hot products that hurt yin. 3.Scientific tonic food and medicine are of the same origin, which is food to satisfy hunger and medicine to cure disease. Like drugs, food with therapeutic effect has its own bias, with five tastes of sour, bitter, sweet, pungent and salty, and four gases of cold, hot, warm and cool. In the consumption should also be based on the condition and constitution, follow certain principles of food therapy selection. Randomly into, not only can not cure the disease, and harmful, so in food therapy should be discriminatory, discriminatory food, according to the person, according to the time, according to the place and appropriate. Do not believe in advertising, and do not believe in the role of tonic products. Instead, you should consult your doctor and experts and choose to take them in a targeted manner to avoid blindly following them.