Cancer is a kind of consuming disease, especially if cancer patients receive anti-cancer treatment, which may lead to the appearance of symptoms such as decrease of body immunity, impaired hematopoietic function and loss of appetite function. Ensuring a high-protein, high-calorie and easy-to-digest diet for cancer patients can help alleviate the toxic side effects of anti-cancer treatment: 1. Food to improve appetite: If cancer patients have loss of appetite, they can eat some hawthorn, plum or drink sour plum soup to help promote appetite. It is necessary to avoid not eating because of emotional and adverse drug reactions, and must ensure sufficient nutritional intake to better accept treatment; 2. Food containing high quality protein and suitable calories: such as milk, eggs, beef porridge, meat ravioli, fish soup, yogurt, tofu, etc., to improve energy by supplementing protein, while sufficient calories can enable patients to complete daily activities; 3. Fresh fruits and vegetables: it is also necessary to eat more fruits The food to enhance physical fitness: such as oats, soybeans, tomatoes, carrots, mushrooms, asparagus, citrus, etc., by regulating the body’s metabolism, scavenging the body’s free radicals, and thus protecting the body’s organs and tissues to enhance physical fitness. In addition, it is also necessary to ensure sufficient water intake. Chemotherapy for cancer patients may cause nausea and vomiting, and sufficient water intake can avoid the water-electrolyte imbalance caused by vomiting. Clinical data show that cancer patients with good nutritional status can better tolerate anti-cancer treatment and have a better prognosis than those with poor nutritional status. If cancer patients are not accompanied by other diseases, there are no other dietary contraindications and they can eat whatever they want, but they need to pay attention to a low-fat diet.