碘是人体生长、发育必需的微量元素。碘缺乏病是人体由于摄入碘不足而产生的一系列疾病和障碍的总称,它并不是单一因素引起的疾病。缺碘究竟对人体产生什么危害,取决于人体在什么时期缺碘及缺碘的严重程度。胚胎期至2岁婴幼儿期是脑发育的关键时期,此时缺碘常造成不可逆的脑发 Iodine is the human body growth and development of essential trace elements. Iodine deficiency disease is a general term for a series of diseases and disorders caused by insufficient iodine intake in the human body. It is not a disease caused by a single factor. Lack of iodine what harm the human body, depending on the human body at what period of iodine deficiency and the severity of iodine deficiency. The embryonic period up to 2 years of age is a critical period of brain development, when iodine deficiency often results in irreversible brain development