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1990年,联合国粮食及农业组织(FAO)、国际原子能机构(IAEA)和世界卫生组织(WHO)的专家委员会,以近20年的研究成果和认识为依据,提出了人体必需微量元素的概念。这个概念的含义包括两个方面:一,微量元素是人体内的生理活性物质、有机结构的必需成分;二,微量元素必须通过食物摄入,当饮食中摄入的量减少到某一低限值时,就会导致某些重要生理功能的缺失。本来这个概念就已经很复杂了,但专家们还不满意,还将以往确定的“必需微量元素”重新进行了分析归纳,分作了以下三类:
In 1990, the UN Food and Agriculture Organization (FAO), the International Atomic Energy Agency (IAEA) and the World Health Organization (WHO) Committee of Experts, based on research and knowledge of nearly 20 years, put forward the concept of essential trace elements in the human body. The concept of the meaning includes two aspects: First, the trace elements of the human body is a physiologically active substance, an essential component of the organic structure; Second, trace elements must be taken through food, when the amount of dietary intake reduced to a certain lower limit Value, it will lead to the deletion of some important physiological functions. Originally this concept had already been very complicated, but the experts were still not satisfied, but also the previously identified “essential trace elements ” was re-analyzed and summarized, divided into the following three categories: