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。

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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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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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