硒为必需的微量元素之一。一般认为,人所需要的硒均来自谷物以及鱼肉等食品,但食物中硒的含量取决于土壤环境,而且存在地域差别。因此,每个人的硒摄取量也不例外,可因这种地域差而显示其不同。大约在30年以前,Schamberger和Frost曾经报道,美国的各地区癌死亡率同该地调查得到的 Selenium is one of the necessary trace elements. Generally believed that people need selenium are from grains and fish and other foods, but the content of selenium in the food depends on the soil environment, and there are geographical differences. Therefore, everyone’s selenium intake is no exception, because of this geographical difference shows the difference. About 30 years ago, Schamberger and Frost reported that cancer deaths by area in the United States were the same as those surveyed in the area