It is said that tumor patients should not eat “hairy food”. The term “hairy food” is a folk term, which is not precisely defined in authoritative medical textbooks and journals, and it is also difficult to find a clear statement in Chinese medicine books. What foods belong to the “hairy”, there are different and often contradictory statements. Many people “prefer to believe it, not believe it”, all the claims are accepted, the list of “hairy things”: chicken, eggs, beef, milk, all kinds of fish and shrimp and other animal foods are listed, the main source of high-quality protein animal foods are treated as As a result, the nutritional status of tumor patients is deteriorating, which is detrimental to the treatment and recovery. Does nutritional supplementation require abstinence from food? In Chinese medicine, the taboo is mainly for “fever”. Fever refers to acute infectious diseases, inflammatory diseases and many other diseases with fever symptoms. The reason why these diseases need to be avoided is because there was a lack of effective treatment such as antibiotics. Nowadays, contraindications are no longer emphasized for such diseases. There are also many contraindications related to allergic disorders such as asthma and urticaria, and it is true that patients with these diseases should not eat foods that trigger allergies. However, tumors are not among the diseases that require strict avoidance of food. Many tumor patients (many of them are not early stage tumors) do not have any contraindications after surgery or radiotherapy, and chicken, fish, shrimp and seafood should not be forbidden in the recipes, and mutton, rabbit, dog and beef can be supplemented in moderation. In clinical practice, there is no case of recurrence or deterioration of tumor disease due to laxity of the diet, so there is no scientific basis to attribute recurrence and metastasis to laxity of the diet. On the contrary, there are many patients who are severely restricted in food variety due to strict avoidance of food, resulting in nutritional imbalance and malnutrition, and are unable to tolerate radiotherapy and chemotherapy, thus forcing treatment to be interrupted. Therefore, tumor patients should not blindly avoid eating. For tumor patients, as long as the dietary structure is reasonable and the variety of food is beneficial, strict dietary restriction is not conducive to recovery.