Epidemiological surveys show that people who consume raw garlic have a very low incidence of gastric cancer because garlic significantly reduces the nitrite content in the stomach, reducing the possibility of synthesis of amines nitrite, thus playing a role in cancer prevention. In addition, the sulfur compounds in garlic mainly act on the “initiation stage” of tumorigenesis, avoiding the transformation of normal cells into cancer cells by enhancing detoxification, interfering with the activation of carcinogens, enhancing immune function, blocking the formation of lipid peroxidation and anti-mutagenesis. Garlic also contains the trace element selenium, which can kill cancer cells. It is generally recommended for cancer patients or people at high risk of cancer to consume garlic or onions regularly to prevent cancer. Onions can be eaten 1-4 a day and garlic can be eaten 1-2 cloves a day, raw and mixed in other dishes as a dressing for the best effect. However, these two foods have certain stimulating effects, so for patients with gastritis or other stomach diseases, we do not recommend eating them raw but cooked. Similarly, eating onions can also reduce the nitrite content in the stomach, the important thing is that onions contain a kind of oak peel substances, for natural anti-cancer substances. Studies have shown that people who eat onions regularly have 25% less stomach cancer than people who eat little or no onions, and have a 30% lower fatal rate of stomach cancer. Some studies point out that adding onions and garlic to the diet every day can help prevent colon, esophageal, oral, breast, ovarian, prostate and kidney cancers. Five kinds of food can help prevent stomach cancer 1. garlic Garlic is a recognized cancer prevention food with obvious anti-cancer effects. Epidemiological surveys show that people who consume raw garlic have a very low incidence of stomach cancer, because garlic can significantly reduce the nitrite content in the stomach, reducing the possibility of synthesis of amines nitrite, thus playing a cancer prevention effect. 2.Onion Eating onion can reduce the nitrite content in the stomach, the important thing is that onion contains a kind of oak peel substance, which is a natural anti-cancer substance. Research shows that people who eat onion regularly have 25% less incidence of stomach cancer than people who eat less or no onion, and the fatal rate of stomach cancer is 30% lower. 3.Mushrooms This kind of food includes mushrooms, shiitake mushrooms, enoki mushrooms, etc. and wood ear. Scientists have found that many mushrooms in food contain anti-cancer substances, which can play a role in cancer prevention. For example, the polysaccharide contained in the winter mushroom has a very high anti-cancer rate. The polysaccharide contained in black fungus and white fungus is also an effective anti-cancer substance. The crude fiber and calcium contained in mushroom foods have anti-cancer effects and can also improve human immunity. Tomatoes contain lycopene and carotene, both of which are antioxidants, especially lycopene, which can neutralize free radicals in the body and is good for anti-cancer of stomach and digestive system, and also effective in preventing breast cancer and prostate cancer. 5.Cauliflower Cauliflower contains more trace elements of molybdenum, which can block the synthesis of carcinogenic substances of amine nitrite and can play an anti-cancer and anti-cancer role. A research report points out that cauliflower also contains an enzyme called small sulfide that can stimulate cell activity, which can stop the formation of cancer cells. Eating cauliflower is useful for preventing esophageal cancer and stomach cancer.