Africans' ability to digest milk likely due to spread of cattle raising

Babies are born with the ability to digest lactose, the sugar found in milk, but most humans lose this ability after infancy because of declining levels of the lactose-digesting enzyme lactase. People who maintain high levels of lactase reap the nutritive benefits of milk, however, offering a potential evolutionary advantage to lactase persistence, or what is commonly known as lactose tolerance.
Source: Health News from Medical News Today - Category: Consumer Health News Tags: Nutrition / Diet Source Type: news