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我们的味觉感知与舌头上的味蕾有关。人类在胎儿到婴儿期，舌头上有1万个左右的味蕾，但会随着年龄增长而减少。而每个味蕾上有大约50到100个味觉细胞，它们可以检测五种基本味道：甜、咸、酸、苦和鲜味。随着年龄的增长，味觉细胞会减少，从而影响我们对食物味道的感知。所以，老年人可能对甜味和咸味不那么敏感，这可能导致他们更喜欢吃更甜或更咸的食物。还有一个原因，老年人的胃口比较小，吃得比较少，所以更倾向选择营养密集的食物，这也是味道变重的缘故。
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