Adults’ ability to drink milk developed during times of hunger

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Humans are the only species that can drink milk in adulthood. The enzyme lactase, responsible for digesting milk, had developed as a mutation during times of hunger when the body needed to digest more food options in order to survive. Communities that drank more milk have a higher lactase percentage.

 

Photo by: https://unsplash.com/photos/_8bnn1GqX70

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