It is wrong to say what cancer patients eat to improve immunity fastest, but eating foods such as fresh fruits and vegetables, high protein and other drugs such as thymidine enteric-coated tablets and recombinant human interferon α1b for injection are helpful for cancer patients to improve immunity. 1. Food: (1) Fresh fruits and vegetables: fresh fruits and vegetables contain high vitamins, which can improve endocrine system, increase body metabolism and improve immunity, and it is good for cancer patients to supplement fresh fruits and vegetables in moderation. (2) High protein food: protein is vital to the human body and has a certain effect on the fight against pathogens. Cancer patients can eat some protein-rich foods, such as lean meat, eggs, milk, etc., which can help enhance the body’s immunity. 2.Drugs: (1) Thymic peptide enteric-coated tablets: the main ingredient contained in the drug is thymic peptide, which is generally used in the adjuvant treatment of tumors, and can help to improve immunity. It should be used according to the doctor’s opinion. It is forbidden for those who are allergic to the drug, organ transplantation patients and patients with thymus tumor. (2) Recombinant human interferon α1b for injection: it has broad-spectrum antiviral, antitumor and immunomodulatory functions, and is suitable for the treatment of viral diseases and certain malignant tumors. The drug can enhance the activity of immune cells and improve the physique of cancer patients. It should be used according to the doctor’s prescription, while those who are allergic to interferon products, pregnant women, and those with a history of severe cardiovascular disease should use it with caution. Cancer patients can improve their body immunity through diet and medication, but diet can only play a certain auxiliary effect on the disease, it is recommended to consult a professional doctor according to their own situation and receive standardized treatment.