Stewart Parnell (center), former president of the now-defunct Peanut Corp. of America, is one of four executives indicted over a 2009 outbreak of salmonella. Mark Wilson/Getty Images hide caption

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A corn field is shrouded in mist at sunrise in rural Springfield, Neb. Nati Harnik/AP hide caption

itoggle caption Nati Harnik/AP

A man buys meat at a butcher's stand in Moscow's Dorogomilovsky market in 2011. On Monday, Russia began blocking U.S. meat imports until those imports are ractopamine-free. Natalia Kolesnikova/AFP/Getty Images hide caption

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Twins in Malawi helped scientists discover a role the gut microbiome appears to play in severe malnutrition. Photograph courtesy of Tanya Yatsunenko hide caption

itoggle caption Photograph courtesy of Tanya Yatsunenko

PepsiCo's product line ranges from salty chips and its sugary namesake drink to more healthful fare like hummus and yogurt. In 2010, the company announced plans to cut sugar, fat and sodium in its products to address health and nutrition concerns. Joe Raedle/Getty Images hide caption

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A farmer holds Monsanto's Roundup Ready soybean seeds at his family farm in Bunceton, Mo. Dan Gill/AP hide caption

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Peanut plants grow on a Halifax, N.C., farm that received federal subsidies in 2011. Robert Willett/MCT /Landov hide caption

itoggle caption Robert Willett/MCT /Landov

The expiration date on foods like orange juice and even milk aren't indicators of when those products will go bad. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Think your prime rib holiday dinner is more pricey this year? You're right. But maybe not for the reason you think. Todd Patterson/iStockphoto.com hide caption

itoggle caption Todd Patterson/iStockphoto.com

Food companies have begun quietly reducing salt in regular foods because low-salt items like these don't sell as well. Mel Evans/AP hide caption

itoggle caption Mel Evans/AP