想咬冰块就是缺铁？这个说法是有一定的科学根据，但是记得，别把吃冰和缺铁的因果关系倒转了：缺铁性贫血的人，确实会比较想咬冰块，但并不代表想咬冰块，就是缺铁性贫血。
先来认识一个异食癖——嗜冰症（Pagophagia），其症状就是会想要咬冰块，而且这跟喝完冰咖啡后，想把冰块放嘴里咔咔一顿咬不一样，它是没来由的，就是想咬冰块的一种冲动。
讲得夸张一点，就是类似吸血鬼对血的渴望那样，只不过嗜冰症患者渴望的是冰块。
证实嗜冰症与铁质缺乏之间存在关系，比较有力的根据主要有两点：
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