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All mammals, including humans, are fed milk, by their mothers, when they are infants. all infants bodies produce an enzyme called lactase, that digests lactose, the kind of sugar found in milk. As they grow, animals and many people stop producing lactase and can no longer digest milk. they become lactose intolerant. people whose ancestors came from areas where dairy foods have long been part of the diet, such as northern and Western Europe, are less likely to become lactose intolerant.

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12y ago
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10y ago

because they don't produce enough of the enzyme lactase to digest the lactose :) hope it helped.

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Q: Why are people lactose intolerent?
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