These fruits include strawberries, oranges, oranges, apples, cantaloupes, kiwis, watermelons, lemons, grapes, grapefruit, pineapples and kiwis. Some special ingredients in them have irreplaceable benefits in preventing colon cancer, breast cancer, prostate cancer and gastric cancer. Strawberry is the most important anti-cancer fruit. Fresh strawberries contain a wonderful tannic acid substance, which can produce anti-toxic effect in the body and prevent the formation of cancer cells. In addition, there is an amine substance in strawberry, which can also play a good role in preventing leukemia, aplastic anemia and other blood diseases. Citrus Fruits Citrus fruits such as oranges, oranges, lemons and grapefruit are rich in bioflavonoids, which can enhance the activity of some enzymes in human skin, lungs, gastrointestinal tract and liver, help transform fat-soluble carcinogens into water-soluble, and make them difficult to be absorbed and excreted. At the same time, they can enhance the human body's ability to absorb vitamin C, an important anticancer substance. Vitamin C can enhance immunity, prevent the formation of nitrosamines, a strong carcinogen, and play a certain role in the prevention and treatment of digestive tract cancer. A Swedish study shows that people who eat one orange a day have a lower risk of pancreatic cancer than those who eat less than one orange a week 1/3. Experts from the Commonwealth Scientific and Industrial Research Organization of Australia said that they found that eating citrus fruits such as oranges and lemons can reduce the incidence of cancer in the mouth, throat, stomach and other parts by 50%, reduce the incidence of stroke by19%, and also have certain preventive effects on cardiovascular diseases, obesity and diabetes. Kiwi is rich in nutrition, which is not only an excellent tonic, but also has a certain anti-cancer effect, among which the vitamin C content is the highest in fruits. Grapes, especially anthocyanins and resveratrol contained in grape skins, are natural antioxidants, which can also inhibit cancer, inhibit malignant transformation of cancer cells and destroy the replication ability of leukemia cells. There is a very useful ingredient in apples-polyphenols, which can inhibit the proliferation of cancer cells. Japanese researchers found that apple polyphenols can reduce the incidence of colon cancer. In addition, cantaloupe and pineapple contain more lutein and zeaxanthin, and watermelon is rich in lycopene. These substances are very effective antioxidants and can play an anti-cancer role. Although the anti-cancer effect of fruit is obvious, it should still be selected and properly matched according to individual characteristics when eating. People often suffer from gastrointestinal dysfunction due to excessive consumption of raw strawberries. In addition, patients with urinary calculi and poor renal function should not eat more strawberries, because it contains more calcium oxalate, and overeating will aggravate the condition. Moreover, the best time to eat fruit is before meals 1 hour. Fruit belongs to raw food. Eating fruit before meals is equivalent to eating raw food before entering cooked food, so that the number of white blood cells in the body will not increase, which is conducive to protecting the human immune system.