Selenium content is so varied in different environment that the blood selenium contents differ from area.
硒在环境中的分布有很大差异，因而人体的全血硒水平存在地区性差异。
Objective Compared the change of blood se level in the elderly people before and after taking food enriched-selenium, and provided references of meal nutrition for the elderly people.
目的对比食用富硒食品前后老年人血硒水平的变化，为老年人硒膳食营养提供参考。
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