流言：坊间老人们都传言，人的指甲月牙越多，代表身体越健康。这是真的吗？真相：月牙数量及大小因人而异，并不能反应健康状况。指甲上的“月牙”其实是新产生的角蛋白细胞，学名为“甲半月”。“月牙”下方是负责生产角蛋白的甲母质，我们的甲板就是由甲母质产生的。每个手指或足趾上都有“月牙”，只是有的会被近端皮肤所覆盖无法看到。“月牙”的数量与大小与角蛋白生成速度有关，并不能反应体质健康与否，年龄、疾病、营养状况、环境和生活习惯的改变均可影响甲板的生长速度。小孩新陈代谢快，甲板生长快，“月牙”数量相对较多，而老年人的“月牙”可随年龄增长而逐渐变小，这是正常的生理现象。对于频繁用手的人来说，指甲磨损速度快的手指，“月牙”就会更明显。如果“月牙”突然变大或突然消失，那么提示指甲生长速度突然加快或减慢甚至停滞，我们要警惕甲状腺疾病的可能。甲亢可引起新陈代谢加快，“月牙”就会变得明显；甲状腺机能减退则会引起新陈代谢减缓，“月牙”也随之变小或消失。
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