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本文以铁在人体内生理功能为依据，结合大量医学研究成果，简要介绍铁不足和铁过量对人体健康的影响，说明微量元素在人体内存在都有一定量和度的限定．
Based on the physiological function of iron in human body and combining with a large number of medical research results, this paper briefly introduces the effects of iron deficiency and iron overload on human health, and shows that there is a certain amount and degree of restriction of trace elements in human body.