碘是人体必需的微量元素。生活在缺碘环境中的人因长期摄入不足就可能缺碘。碘是合成甲状腺素的原料,缺乏甲状腺素,会严重影响人的正常生理活动,并引起一系列的人体机能紊乱及疾病,尤其会影响儿童神经系统的发育成熟和身体的生长发育。缺碘会影响人的智力发育,这一事实已被广泛证实。尤其在人的胚胎发育期及婴幼儿期缺碘,小儿会发生先天性白痴,或成长后发生痴、傻、聋哑、矮小以及运动神经障碍等。1990年世界儿童首脑 Iodine is an essential trace element of the human body. People living in conditions of lack of iodine may lack iodine because of chronic ingestion. Iodine is the raw material for the synthesis of thyroxine. The lack of thyroxine can seriously affect people’s normal physiological activities and cause a series of human disorders and diseases, especially affecting the children’s nervous system development and body growth. The fact that iodine deficiency affects one’s mental development has been widely confirmed. Especially in human embryonic development and childhood iodine deficiency, children with congenital idiots, or after the growth of crazy, silly, deaf, short, and motor neurological disorders. 1990 World Children’s Summit