Rectal cancer to lung cancer diet should pay attention to give patients nutritious and less crude fiber food, such as eggs, lean meat, soybean products and fine grains, tender leafy vegetables, etc.; and advise patients to drink more honey water and eat banana, duck pear, etc., which has the best effect of laxative with honey. In addition, you can eat more food that is good for lung metastases, such as common anticancer food, cruciferous vegetables, radish, garlic, soybean, Job's tears, yam, jujube and so on. Contraindications: I. Avoid hot food such as fried oil and barbecue. Second, avoid spicy stimulating food: onion, garlic, leek, ginger, pepper, chili, cinnamon, etc. Third, avoid alcohol. Fourth, avoid greasy, sticky phlegm-generating food.