Only Luxembourgers eat more meat per person than Americans. hide caption

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Men at a slaughterhouse stand near hanging beef carcasses, late 1940s. Lass/Getty Images hide caption

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The FDA's latest effort to end the use of antibiotics as growth promoters in animals is getting mixed reviews from activists. Rob Carr/AP hide caption

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Pigs take a mud bath at the De Jofrahoeve pig farm in Esch, Netherlands. Dutch farmers treat their animals with almost three times the antibiotics that their Danish neighbors use. Robin Utrecht/AFP/Getty Images hide caption

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Breeding sows in crates at a subsidiary of Smithfield Foods in 2010. The photo was shot by the Humane Society as part of an undercover investigation. Humane Society/Associated Press hide caption

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Many livestock groups say there's no evidence that antibiotics in livestock feed have caused a human health problem, but researchers beg to differ. Scott Olson/Getty Images hide caption

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A holding pen for lambs at the Will-O-Wood Farm in southeastern Ohio. Meta Van Nostran hide caption

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Adrian Mesa protests the overuse of antibiotics in meat production outside a Burger King in Coral Gables, Fla. in 2003. Joe Raedle/Getty Images hide caption

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Jennie Grant greets her goat Eloise in Seattle. No stranger to urban farming, Grant already had chickens, bees, and a large vegetable garden before she added goats to her lineup. Elaine Thompson/AP hide caption

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