One, green vegetables: including spinach, leeks, lettuce, etc. These vegetables contain antioxidants such as B-carotene and folic acid. Scientists point out that the darker the green vegetables, the more antioxidants, the stronger the ability to fight cancer. Second, onion vegetables: including onion, garlic, onion, etc.. According to scientific analysis, these vegetables contain spicy elements, trace elements of selenium, etc., which can not only kill a large number of bacteria, but also kill cells. Selenium can clear the development of tumors play an important role in the free radicals, liver cancer, pancreatic cancer, stomach cancer, colon cancer have preventive and therapeutic effects. Third, citrus fruits: including oranges, grapes, grapefruit, oranges, lemons. These fruits contain almost all natural anti-cancer substances and are especially effective in preventing pancreatic cancer. Fourth, cruciferous vegetables: including cabbage, cauliflower, radish, etc. This vegetable contains a powerful anti-cancer substance that forms a film against cancer. It also contains an anti-tumor and anti-virus substance that can stimulate cells to produce interferon, which can prevent esophageal cancer, stomach cancer, nasopharyngeal cancer and uterine cancer. Five, coarse grains: coarse grains have a kind of inhibitor called “dirty enzyme”, research found that this inhibitor has the role of organizing the spread of skin cancer, transplantation of liver cancer, colon cancer growth. Corn contains more carotene, which can be digested by the body and transformed into physiologically active vitamin A, which has an inhibitory effect on lung cancer, stomach cancer and esophageal cancer. Six, green tea: green tea contains special phenols: polyphenols, chlorogenic acid, etc., which have a preventive effect on liver cancer, lung cancer, skin cancer and digestive tract cancer.