流行病学研究发现硒的摄入能降低心脏病和癌症的危险性。因而引起人们去研究确定长期摄入硒的最大限量的兴趣。为了确定富硒地区居民摄硒是否引起中毒,我们研究了饮食摄入硒与血硒浓度的关系及摄硒与居民健康的关系。南达科他地区可耕地表层含硒量较高,因此该地区食物富 Epidemiological studies have found that the intake of selenium can reduce the risk of heart disease and cancer. Which has caused people to study the maximum interest in determining the long-term intake of selenium. In order to determine whether selenium inhalation in selenium-rich areas causes poisoning, we studied the relationship between dietary selenium and blood selenium levels and the relationship between selenium exposure and residents’ health. South Dakota has a high level of selenium on the arable land surface and is therefore rich in food in the area