碘是合成甲状腺激素的必需物质。显然,缺碘是发生地甲病的主要因素。但在某些发达国家的现代化城市中虽然碘的供应充足,甚至超过合成甲状腺激素每天所需要的量,然而在那里却仍有甲状腺肿或因供碘引起的其他甲状腺疾病发生。近年根据国外对地方性甲状腺肿流行病学调查,越来越多的人认为碘大大地被滥用了。摄入过多的碘可影 Iodine is an essential substance for the synthesis of thyroid hormones. Obviously, iodine deficiency is the main factor in the occurrence of a disease. However, in some modernized cities in developed countries, iodine supply is sufficient, even more than daily synthesis of thyroid hormones, but there are still thyroid or other thyroid diseases caused by iodine supply. In recent years, according to the epidemiological survey of endemic goitre abroad, more and more people think that iodine is greatly abused. Excessive intake of iodine can be shadowed