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Cattle herders in South Sudan are part of a dairying tradition that stretches back at least 6000 years, according to a new study. Eric Lafforgue/Art in All of Us/Corbis/Getty Images
Humans were drinking milk before they could digest it
Jan. 27, 2021 , 5:00 AM
Our history with milk presents a chicken-or-egg conundrum: Humans couldn’t digest the beverage before they evolved mutations that helped them do so, yet they had to already be consuming milk to change their DNA. “There’s always been the question of which came first,” says University of Pennsylvania geneticist Sarah Tishkoff. “The cultural practice or the mutation.”
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