Why are so many people in the world unable to digest lactose?
In: Biology
Everyone can actually. At least at first. The gene that produces lactase (the enzyme that breaks down lactose, the sugar in milk) gets turned of after puberty normally. If the gene doesn’t get turned off you can continue to drink milk just fine into old age. This mutation is believed to have first come out of Europe (which explains why it is so much more common in white people) and spread out of Europe into other ethnic groups.
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