Selenium anti-cancer effects a. Enhance immunity Organic selenium can scavenge free radicals in the body, eliminate toxins in the body, antioxidant, can effectively inhibit the production of lipid peroxide, prevent blood clots, remove cholesterol, enhance human immune function. Prevent diabetes Selenium is the active component of glutathione peroxidase, which can prevent the oxidation and destruction of pancreatic beta cells and make them function normally, promote sugar metabolism, reduce blood sugar and urine sugar, and improve the symptoms of diabetic patients. Third, to prevent cataracts retina due to exposure to computer radiation and other more, vulnerable to damage, selenium can protect the retina, enhance the vitreous polish, improve vision, have the effect of preventing cataracts. Fourth, to prevent cardiovascular disease selenium is an important element to maintain the normal function of the heart, the heart muscle has the role of protection and repair. The reduction of human blood selenium level will lead to the body to remove free radicals, resulting in increased deposition of harmful substances, increased blood pressure, thickened blood vessel walls, reduced vascular elasticity, slower blood flow, reduced oxygen delivery function, thus inducing the incidence of cardiovascular diseases, however, scientific selenium supplementation to prevent cardiovascular diseases, hypertension, atherosclerosis, etc. have a better effect. Fifth, to prevent Creutzfeldt-Jakob disease, osteoarthritis, arthritis Selenium deficiency is the main cause of Creutzfeldt-Jakob disease, osteoarthritis, two endemic diseases, selenium supplementation can prevent bone marrow end lesions, promote repair, while in protein synthesis to promote disulfide bonds against metal elements detoxification. For these two endemic diseases and arthritis patients have a very good preventive and therapeutic effect. Sixth, detoxification, detoxification selenium and metal binding is very strong, can resist the poisoning of cadmium on the kidneys, gonads and central nervous system. Selenium and the body of mercury, lead, tin, thallium and other heavy metals combined to form a metal selenoprotein complex and detoxification, detoxification. Seven, prevention and control of liver disease, protection of the liver China’s medical experts Yu Shuyu after 16 years of epidemiological investigation in areas with high incidence of liver cancer found that the selenium content in the blood of residents in areas with high incidence of liver cancer are lower than those in areas with low incidence of liver cancer, and the incidence of liver cancer is negatively correlated with the blood selenium level. She confirmed that selenium supplementation to 130,000 residents in Qidong County, Jiangsu Province, could reduce the incidence of liver cancer by 35% and the incidence of those with family history of liver cancer by 50%. Why does selenium have anti-cancer effect In 1973, Raymond Shamburger and others disclosed a surprising finding: they investigated 34 American cities with roughly the same size, 17 of which were located in areas with high selenium content, the cancer mortality rate was about 127 per 100,000 residents; while the other 17 cities with low selenium content, the cancer mortality rate was as high as 175 per 100,000 residents. The cities with the lowest mortality rates happen to be the ones with the highest selenium content in the soil. Some people analyze the food consumption of more than 20 countries and thus calculate the intake of selenium, and found that people’s selenium intake and leukemia, colon cancer, rectal cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, gallbladder cancer, lung cancer and skin cancer, etc., are negatively correlated, that is, low selenium intake and high incidence of the above cancers. The anti-cancer effect of selenium can also be confirmed by animal experiments. Experiments by Dr. J. L. Martin of Colorado State University showed that mice fed with selenium had much stronger immune function than mice not fed with selenium. It was also reported that the mice were divided into two groups, one group was supplemented with selenium in the feed and the other group was only fed with normal feed as the control, and the occurrence of spontaneous tumors in the mammary glands of the two groups was observed, and the result was that the tumor incidence rate of the unsupplemented selenium group was as high as 82%, while the selenium supplemented group was only 10%. The principle of the anti-cancer effect of selenium: 1, antioxidant effect: selenium is a component of glutathione peroxidase (GSH-Px), each mole of GSH-Px contains 4 grams of atomic selenium, the role of this enzyme is to catalyze the redox reaction between reduced glutathione (GSH) and peroxide, so it can play an antioxidant effect, is an important free radical scavenger. In the body, GSH-Px and vitamin E antioxidant mechanism is different, the two can complement each other, with synergistic effects. 2, enhance immunity: organic selenium can scavenge free radicals in the body, eliminate toxins in the body, antioxidant, can effectively inhibit the production of lipid peroxide, prevent blood clots, remove cholesterol, enhance human immune function. 3, detoxification, detoxification: selenium and metal binding force is very strong, can resist cadmium poisoning of the kidneys, gonads and central nervous system. Selenium and the body of mercury, tin, thallium, lead and other heavy metals combined to form a metal selenoprotein complex and detoxification, detoxification. Preventing liver disease and protecting liver: After 16 years of epidemiological survey in areas with high incidence of liver cancer, it was found that the selenium content in the blood of residents in areas with high incidence of liver cancer is lower than that in areas with low incidence of liver cancer, and the incidence of liver cancer is negatively correlated with blood selenium level, and selenium supplementation in cancer prevention experiments among residents in Qidong County, Jiangsu Province can reduce the proportion of liver cancer occurrence and lower the incidence of those with family history of liver cancer. In conclusion, many studies have shown that selenium as an antioxidant can play a role in protecting cells and preventing cancer. Selenium has a stimulating effect on immune response, i.e. selenium can improve the immune function of the body, which can kill cancer cells and prevent normal cells from becoming cancerous through the immune system.