A new study on lactose tolerance among early farmers in Spain challenges a leading theory that humans developed an appetite for milk to avoid calcium deficiency. iStock hide caption

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Sticker shock in the dairy aisle? If the government fails to pass the farm bill, milk prices could spike sometime after the first of the year. George Frey/Landov hide caption

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Madison Fitzgerald, 20, holds her baby, Jake, in the neonatal intensive care unit at Texas Children's Hospital in Houston. Jake, who was born 16 weeks too early, receives donor breast milk every three hours by mouth. Carrie Feibel/KUHF hide caption

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Researchers are learning more about how to treat milk allergy by giving kids a small amount of milk protein, but it needs further study. MICHAEL PROBST/ASSOCIATED PRESS hide caption


Parents are currently advised to switch toddlers to reduced-fat milk at age 2. David M. Goehring/Via Flickr hide caption

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Thousands of years ago, a mutation in the human genome allowed many adults to digest lactose and drink milk. iStockphoto.com hide caption

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Dairy farmer Bob Andrews feeds heifers in the same barn his grandfather used. He says today "the harder you work, the further you get behind." David Sommerstein/NCPR hide caption

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European dairy farmers spray police officers with milk during a demonstration outside the European Parliament in Brussels on Monday. Geert Vanden Wijngaert/AP hide caption

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Laura Chase, a member of the MOOMilk dairy cooperative, sweeps her barn in a film still from documentary, Betting The Farm. Pull-Start Pictures hide caption

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A customer studies a display of milk and dairy products at Bryan's Grocery in San Francisco in March. Justin Sullivan/Getty Images hide caption

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