Most people experience poor appetite during radiation and chemotherapy due to mental stress and treatment reactions, at a time when the body needs a lot of nutrition to fight the disease and recover. Therefore, it is important to ensure adequate nutrition as much as possible. But in the process of supplementation, people often have the following misconceptions: 1, the more expensive things are better. Expensive supplements and foods are good for your health, but not the more the better. The modern concept of nutrition is nutritional balance, that is, not a large number of supplements or a large number of expensive food to ensure nutritional supply. What the human body needs on a daily basis are carbohydrates (sugar), proteins (meat, etc.), fats and vitamins and minerals, i.e. daily rice, flour, various meats, animal and vegetable oils, vegetables and fruits. During the treatment period, the correct way to supplement nutrition is to ensure three or more meals per day of the above-mentioned daily food, and then supplement with expensive supplements or food in appropriate amounts. This is the correct way of nutrition supplementation. Instead of seeking the end at all, taking expensive supplements and food as the top priority every day will be counterproductive and lead to malnutrition or nutritional imbalance. 2, the food “abstinence” or “taboo” problem. Both Chinese and Western medicine have the same requirement of abstaining from certain foods for a specific period or for certain patients. However, there is a misconception that the food taboos for tumor patients have been expanded and absolutized by folk or some doctors. The basic theory of Chinese medicine in explaining human diseases is the loss of balance between yin and yang of human body or organs, and the treatment of diseases is to apply various means (including Chinese medicine, food therapy, acupuncture, massage, gua sha, fire cupping, etc.) to adjust and restore the balance. Therefore, according to the folk saying of avoiding various foods for tumor patients, then the only things that tumor patients can eat every day are rice, noodles, pork and a small amount of freshwater fish. Imagine if a healthy normal person eats the above mentioned food for a long time, it will not take long before the appetite problem occurs first, such a monotonous food will have no appetite after eating for a few days, and if they insist on eating, they will soon suffer from malnutrition or nutritional imbalance, which will eventually lead to diseases. Tumor patients need a lot of nutrition during the treatment period, therefore, it is extremely wrong to strictly abstain from eating according to the folk saying. The correct choice is to eat all kinds of food, as long as you don’t eat partially and don’t overeat a single food at a time, there is no problem. Different foods provide different nutrition, a balanced diet is the right approach. 3.Side effects. During radiotherapy, due to treatment reaction and side effects, some patients will experience nausea, vomiting, sore throat, difficulty in swallowing, etc. Seriously, it will affect the normal diet, and at this time, the body needs a lot of nutrition. This will have a negative impact on the effect of treatment and the recovery of the body after treatment. At this time, doctors will recommend patients to receive appropriate intravenous nutritional support treatment. However, some patients are reluctant to receive intravenous nutritional support therapy because they are afraid of injections or think that intravenous infusion is only for patients with severe disease or think that intravenous infusion will have serious side effects. The right choice is to receive intravenous supplementation of basic nutrients such as sugar, protein and vitamins needed daily to ensure daily energy supply, which is sufficient and costs little money, but can achieve significant results, patients can reduce symptoms and speed up recovery. However, it should also be noted here that the vast majority of patients just need to supplement the general intravenous nutrition is sufficient, there is no need to apply a variety of expensive drugs.