There may be no taboos in the diet of patients with early cancer, but patients with advanced cancer, especially those with high malignancy, must pay attention to eating nutritious food under the guidance of doctors, because cancer is a wasting disease, and eating nutritious food will make cancer cells grow rapidly. However, if the corresponding treatment is carried out, such as the tumor is well controlled after chemotherapy, then nutrition can be strengthened at this time. This is a relative situation, so we must pay attention to it.