全球大多数成年人由于缺乏乳糖酶（负责分解乳糖的酶）而无法消化牛奶。这种不适被认为是人类的进化常态。然而，一小部分成年人口发展出了乳糖耐受性，这是一种允许他们消化牛奶的特征，在进化过程中相对较快地演变而来。 AI
排序理由 该条目是专家对一种生物现象的解释，而非新发布或重要的行业事件。
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进化生物学家解释为何大多数成年人无法消化牛奶
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报道来源 [1]
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仅35%的成年人能消化牛奶——一位进化生物学家解释原因
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