老年人是肿瘤、冠心病和白内障等疾病的高发人群。体内微量元素硒摄入不足会使某些肿瘤、冠心病和白内障等疾病的危险性显著增加。过去人们对硒的认识不足,认为它与镉、砷一样是一种致人于死地的可怕元素。但国内外研究最终证实硒是一种难得的营养素和抗癌元素。硒是谷胱甘肽过氧化物的催化剂,此酶可催化、还原脂质过氧化物及过氧化氢,以消除过氧化作用和抑制自由基的链锁反应,因而具有抗癌作用。中美科学家对我国八省 The elderly are cancer, coronary heart disease and cataract and other diseases of the high incidence of the crowd. Inadequate intake of trace elements in the body of some tumors, coronary heart disease and cataracts and other diseases significantly increased the risk. People in the past lack of understanding of selenium, that it is, like cadmium, arsenic is a terrible element of death. However, domestic and foreign research eventually confirmed that selenium is a rare nutrient and anti-cancer elements. Selenium is a glutathione peroxidase catalyst, this enzyme can catalyze the reduction of lipid peroxides and hydrogen peroxide to eliminate peroxidation and inhibition of free-radical chain reaction, which has anti-cancer effect. Chinese and U.S. scientists on eight provinces in China