Lactase persistence occurs in human populations with a long history of animal husbandry and milk consumption.

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Lactase persistence is the ability to digest lactose (the sugar in milk) into adulthood. This adaptation has evolved in human populations that have a long history of dairy farming and milk consumption. These populations include those from Europe, the Middle East, and parts of Africa. Thus, lactase persistence is more common in these populations compared to those from regions where dairy farming and milk consumption are not as prevalent.

Lactase Persistence Occurs in Human Populations with a Long History