Many tumor patients and their family members have read articles about tumor patients’ diet through the internet or books and learned some useful knowledge, which plays a positive role in tumor treatment and recovery. However, some people fall into some misunderstanding and some others listen to folklore, which results in such a status quo: during chemotherapy, you can see some patients dare not eat what they want to eat, thinking that it will make tumor grow faster; some family members also ask patients not to eat this and that. What we need to know is: do we need to avoid eating during chemotherapy? As we all know, the most common side effects of chemotherapy are gastrointestinal reactions, such as loss of appetite, stomach discomfort, nausea, vomiting and diarrhea. This directly leads to reduced nutritional intake, decreased physical fitness and slow recovery of the patient’s body after chemotherapy, which affects the next treatment plan. Therefore, in addition to active adjuvant therapy to alleviate gastrointestinal reactions during chemotherapy, the patient’s own nutritional intake is also very important. The dietary principles during chemotherapy are based on easily digestible, light, fresh and nutrient-rich foods. The human body needs three main nutrients: carbohydrates, proteins and vitamins. Carbohydrates are mainly obtained through rice and pasta, proteins are mainly obtained through meat, fish, eggs and soy products, and vitamins are mainly obtained through vegetables and fruits. During chemotherapy patients should try to maintain a balanced intake of various nutrients in their recipes, and when the quantity of food is reduced, we should try to ensure the quality, the so-called “less but more”. However, it is important to remember that each patient’s eating habits and digestive function of various foods are different! The recipes provided by nutrition experts can be used as a reference, but they should not be copied in a dogmatic way. For example, some patients usually like spicy and heavy food, and they have a poor appetite during chemotherapy, but you ask for light food and no pepper, can they eat anything? Some patients like to eat fried things or pickles, but you forbid, appetite is not good, like and do not allow to eat, do not eat something from the nutrition? Some patients only like to eat beef and chicken, but you say that these are “hairy” and can not eat, so where does the protein come from? Therefore, we should try to let patients eat something during chemotherapy to ensure that they can get some nutrition. In addition, we are afraid that food will cause tumor cells to grow faster, which is not a problem to worry about, because chemotherapy drugs are more sensitive to fast-growing tumor cells and more effective in killing them. So when patients ask me if they need to avoid eating during chemotherapy? My answer is very simple: according to your own diet, as long as you eat without any discomfort, you don’t need to avoid eating.