In the process of tumor treatment, any beneficial way to fight cancer is something that patients and their families do not want to miss. “Food is the most important thing for people, and tumor patients should pay more attention to their diet. Moreover, a healthy diet is really beneficial for patients’ tumor treatment. Patients and their family members must have a plan in their mind about what to eat more, less and not to eat! First of all, it should be clarified that eating more and eating less means that the proportion of such foods in the daily diet structure should be on the large or small side, which does not mean that we should only eat the foods suggested to be “eaten more” and not eat the foods suggested to be “eaten less”. Eat more 1, vegetables and fruits, whole grains Vegetables, fruits, whole grains are rich in dietary fiber and vitamins, this kind of food not only helps to control body weight, but also has a preventive effect on tumors. Many studies have pointed out the beneficial effects of vegetables, fruits and whole grains on cancer prevention. For example, the AICR (American Institute for Cancer Research) Cancer Prevention Guidelines state that whole grains and foods rich in dietary fiber can reduce the risk of colon cancer, and non-starchy vegetables and fruits can reduce the risk of cancers of the upper whistling gastrointestinal tract and other cancers; there are also studies that show that a higher intake of fruits and vegetables can significantly reduce the risk of breast cancer; brassica vegetables, such as kale, cabbage, and broccoli, are capable of maintain intestinal health and prevent colon inflammation and colon cancer. In fact, eat more vegetables and fruits appear in many authoritative cancer prevention guide recommendations, it is recommended to eat at least 400g of various types of vegetables and fruits every day, at least 30g of food sources of fiber. 2, beans and other foods rich in high-quality protein Protein can help the body grow, tissue repair, and enhance the antibodies against disease, so for tumor patients, protein supplementation is very important, high-quality protein because it is easier to be absorbed by the human body, so it will be recommended to patients to supplement more high-quality protein. Sources of high-quality protein are mainly, plant-based high-quality protein soybean and animal-based high-quality protein lean meat, fresh fish and shrimp, dairy products.The Dietary Guidelines for Patients with Malignant Tumors, issued in March 2018, suggests that patients with tumors should consume a moderate amount of soybeans and soybean products every day, and it is recommended that the daily intake of soybeans should be about 50 g of equivalent amount. The Dietary Guidelines for Chinese Residents 2016 recommends a daily intake of fish and shrimp of 40 g to 75 g, livestock and poultry meat of 40 g to 75 g, and eggs of 40-50 g. Moreover, the simultaneous consumption of different types of high-quality proteins, such as the simultaneous consumption of plant-based high-quality proteins and animal-based high-quality proteins, can improve the efficiency of the patient’s organism in the utilization of high-quality proteins. Eat less 1. Red meat and processed meat Red meat refers to all types of mammalian meat, e.g. beef, lamb, etc. Processed meat refers to any meat that has been salted, dried, fermented, smoked, or otherwise processed to enhance flavor or extend shelf life, e.g. ham, sausage, bacon. Evidence suggests that excessive intake of red meat and processed meat may increase the risk of colorectal cancer, according to the AICR’s recommendation, the weekly intake of red meat should not exceed 500 grams, try not to eat processed meat. 2, high-fat, high-starch or high-sugar processed food Excessive high-fat, high-starch or high-sugar processed food can lead to weight gain, overweight and obesity, and the AICR Cancer Prevention Guidelines point out that strong evidence proves that obesity is a factor in the development of many cancers. In addition, a high-fat diet will promote tumor growth through the abundance of nutrients and growth factors, therefore, it is recommended that tumor patients should eat less. Don’t eat 1. Don’t drink any drop of alcohol Any dose of alcohol, even just a drop, increases the risk of many types of cancer, whether it is beer, wine, spirits or other beverages and other sources of alcohol. 2, quit smoking Smoking is the World Health Organization’s International Agency for Research on Cancer identified a class of carcinogens, even if it is not cancer population, should also quit smoking as soon as possible. Dietary taboos 1, some fruits can not be used with some anti-cancer drugs Grapefruit (grapefruit, also known as grapefruit), grapefruit juice, Seville oranges (seville orange) can not be used with the breast cancer treatment drug Olaparib. In fact, grapefruit affects the efficacy of many anti-cancer drugs, such as the lung cancer drugs erlotinib and gefitinib. Patients should pay attention to the medication, and it is strongly recommended to read the drug instructions carefully or consult the doctor before using the drug. 2.Breast cancer patients avoid food containing animal estrogen Breast cancer has a close relationship with human estrogen, therefore, any food containing, or may increase animal estrogen in human body, breast cancer patients should be prohibited from eating. Note that breast cancer patients can drink soy milk! The phytoestrogens in soy milk are not the same substance as animal estrogens. Dietary Misconceptions Misconceptions 1: Only eat anti-cancer food We must have heard of anti-cancer food, some people will say, since there is anti-cancer food, then we only eat anti-cancer food is not on the line? This approach is not desirable! There are indeed anti-cancer foods, but we must be clear. First of all, the current evidence about the anti-cancer ability of food, many from the cell, animal research results, which can not fully represent the conclusions of human clinical trials. Secondly, even if a certain food/class of food is confirmed to have anticancer effects through clinical trials, it is not possible to eat only this type of food because no single food or food component can protect the body from tumors on its own, and only the synergistic effect of compounds in the diet as a whole can provide the strongest “anticancer” protection for the human body. Therefore, even if a food has anti-cancer properties, you should not eat only anti-cancer foods. A balanced diet is the best way! Myth 2: Take dietary supplements for nutrition The NCCN guidelines state that the routine use of dietary supplements for cancer control is not recommended. The body should get the nutrients it needs from food and should not rely on dietary supplements. It has not yet been possible to prove that micronutrients reduce cancer risk. However, if a patient faces nutrition-related problems during treatment, such as malnutrition due to inability to eat. In this case, the patient is unable to get nutrition through daily diet and needs to get nutritional support from other sources. At this time, it is important to ask the doctor to give the appropriate treatment, and not to buy some dietary supplements without authorization to help nutritional supplementation. In conclusion, eating more vegetables (fruits), less meat, no tobacco and alcohol, clear taboos and balanced diet is the way of eating for tumor patients. May all patients eat healthy!