Malignant tumor is a systemic disease, which not only grows infiltratively locally and destroys normal tissues and organs, but also consumes a large amount of nutrients in the process of growth, plus the toxic substances produced by cancer tissues affect the vitality of the body, resulting in a series of nutritional disorders and metabolic disorders for patients, causing malnutrition and gradually reducing the resistance of the patient’s body, aggravating infection or leading to the failure of important organ functions. As a result, malnutrition causes a series of nutritional disorders and metabolic disorders to patients, resulting in a gradual decrease in the resistance of the patient’s body, aggravating infection or leading to the failure of important organ functions and death. Therefore, it is a very important issue to study the improvement of nutrition and understand the diet and living of tumor patients. Many family members have misunderstandings and heard that many things cannot be eaten, but they are not! So how do tumor patients actually carry out dietary regimen? How to properly supplement nutrients? Should cancer patients avoid eating and what are the advantages and disadvantages of avoiding food, etc. On this issue, some patients’ family members are eager to get a more satisfactory answer. However, there are two very different advocates and views on this issue. One is one-sidedly pursuing nutrition, thinking that all food should not be avoided, and all food containing nutrition can be eaten, and avoiding food will affect nutrition and cause malnutrition and weaken the body’s ability to resist disease; the other one overemphasizes avoidance, thinking that all “hairy things” and non-vegetarian dishes and even some vegetables cannot be eaten, otherwise it will make the tumor develop and deteriorate easily, and generalize. Without analysis, everything is forbidden. These two views are one-sided and do not conform to objective reality. It is an objective fact that diet has a certain relationship with the development of disease. In cancer treatment, besides applying medication, paying attention to dietary contraindications and adopting appropriate dietary regimen can effectively reduce the disease, relieve symptoms, enhance physical fitness, prevent and delay the occurrence of cachexia, prolong survival and even promote the cure of tumor. We believe that it is very necessary to increase the overall nutrients for cancer patients and pay attention to eat more foods that are beneficial to the nutritional aspects of the body, especially to increase protein and vitamins, in order to increase the body’s ability to resist disease, prevent the occurrence of cachexia and compensate for the consumption of cancer tissues on the body. Because most of the tumor patients consume a lot of nutrients, have poor appetite, are weak, and even have serious anemia, they should choose some nutritious and aromatic foods that can be easily digested and absorbed, such as meat, fish and shrimp, eggs, dairy products, fresh vegetables, fruits and mushroom foods such as mushrooms, mushrooms and fungus, to enhance appetite, nourish qi and blood, and adjust the functions of internal organs. It can enhance appetite, nourish qi and blood, and adjust the functions of internal organs. In conclusion, it is of certain positive significance to give cancer patients a large amount of nutrition, eat more fresh vegetables, fruits and fish, and eat less greasy food, and pay attention to and protect the immune function of tumor patients to inhibit the development of tumor. To summarize: 1. avoid spicy and stimulating food, cold and overheated food, and food containing too much collagen fiber, such as pig’s feet; 2. eat nutritious food, fish, shrimp, meat, eggs, milk and fresh vegetables; 3. in food preparation, use less frying and other cooking methods, mainly boiling and stewing, which may destroy some nutrients, but it is most important to be absorbed!