70 time evening, content of the Selenium in the soil to 46 cities, plant and food undertakes the United States determine, discover the area with selenium less content, the incidence of a disease of breast cancer, colonic cancer and prostate cancer is higher. Be in Philippine, Thailand, Puerto Rico, Madagascar and Japan, content of dweller blood Selenium is about 0. 26 - 0. 29 milligram ／ rises, cancer mortality is inferior; And Australia, New Zealand, England, United States, Sweden, Norwegian hematic Selenium content is only 0. 7 - 0. 2 milligram ／ rises, the mortality of all sorts of cancer is tall also. 1/4 what the hematic Selenium content of these national dwellers is Asian country dweller only, and the incidence of a disease of breast cancer is Asian area 5 - 8 times.
Institute of national cancer of Chinese academy of medical sciences and United States is opened to Jiangsu east the county is mixed the liver cancer of Henan forest county and esophagus cancer undertake intervention with selenium, in 1984 - furnished 4 years to local dweller continuously 1987 with inferior the yeast of aggrandizement of Selenium of the salt of aggrandizement of selenium acerbity natrium, profess to convinced, spray on crop selenium is fat, through observation discovery of 6 years, cancerous incidence of a disease compares the liver cancer of filling Selenium dweller and esophagus not to fill the fall of selenium dweller 50 ％ , this shows, advocate dweller filling Selenium, enhance immune power, to preventing the port with fight cancer to have very cancer, principal.
The expert of courtyard of Chinese farming division saved the cloth of 1094 counties town of city municipality 30 times to establish 1782 sampling point to the whole nation, scale our country crop contains selenium to estimate distributinging figure, be short of selenium to be able to be caused include disease of cancer, liver, heart disease inside more than 40 kinds of diseases. Our country has the area of 2/3 to belong to the area is short of selenium with accepted international about, from the thing 3 provinces are inclined wear the Yunnan-Guizhou Plateau. Of different and phyletic crop get together selenium ability is to have very big difference, roughly for, the volume containing selenium of soja, wheaten, paddy is higher, horsebean, pea, corn is inferior, sweet potato lowest. To make people is in normal and prandial outside again a few more compensatory selenium, scientists prepared a lot of good filling Selenium food, for example: Salt of flour of bacterium of edible of selenium yeast, rich Selenium, rich Selenium, rich Selenium, the adult suggests to absorb a quantity to be everyday 60 - 200 microgramme.