The science behind lactose intolerance

12/31/2012 | National Public Radio

Nobody knows for certain why some humans remained lactose intolerant while others evolved with a genetic mutation that allows them to digest dairy products, says evolutionary geneticist Mark Thomas. His theory centers on the idea that farmers who migrated from the Fertile Crescent to Northern Europe turned to milk for nourishment during famines, and those healthy enough to handle it eventually developed the mutation.

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