Answer :
Lactase deficiency is more common in Asian, Native American, Mediterranean, and African populations because of their inability to digest milk after infancy.
All mammals feed on their mother's milk during infancy. As they mature, they lose the ability to digest milk because, after infancy, they stop producing the enzyme lactase, required to digest the milk. The only mammal that can consume milk throughout life is the human.
Lactase deficiency is more common in Asian, Native American, Mediterranean, and African populations. This is because the ancestors of these populations lived in very cold or hot climatic conditions where they couldn't support dairy herding. They, therefore, could adapt themselves to lactose digestion.
On the other hand, the ancestors of northern and western Europeans relied on dairy products as an important part of their food supply. They often lived in conditions where other food sources were scarce but they could herd domestic animals for dairy products. This helped them to adapt to the condition and retained the ability to digest milk by producing the enzyme throughout life.
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