定义：由于饮食中长期缺乏维生素和矿物质而引起的微量营养物缺乏症，通常没有明显警示信号。
Definition: micronutrient deficiency caused by a chronic lack of vitamins and minerals that often has no visible warning signs.
幸运的是，存在一种简单的保护方式，这就是碘化钾。它是通常添加到食盐中的一种简单的化合物，可以预防甲状腺肿大和因碘营养缺乏所致一种精神障碍。
Fortunately, an easy form of protection is potassium iodide, a simple compound typically added to table salt to prevent goiter and a form of mental retardation caused by a dietary lack of iodine.
除此之外，一些食谱太过于限制碳水化合物摄入量，以至于出现营养缺乏或者纤维素摄入量不足。
In addition, some diets restrict carbohydrate intake so much that they can result in nutritional deficiencies or insufficient fiber.
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