自然界中的碘典型地存在于碘化物中,并通过碘循环使其在动植物中的含量显著可变。其含量的可变性影响到人体中碘的状况。现就碘的主要食物来源、营养作用、需要量、代谢、缺乏和可能的毒性作用来理解和解释对碘的认识。 Iodine in nature is typically found in iodides and its content in animals and plants is significantly variable by iodine cycling. The variability of its content affects the status of iodine in the human body. The understanding of iodine is understood and explained in terms of the main sources of iodine, its nutritional effects, its requirements, its metabolism, its lack and possible toxicological effects.