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

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Vernon Hugh Bowman lives outside the small town of Sandborn, Ind. Dan Charles/NPR hide caption

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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

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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

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Farmworkers like these in California picking produce may soon be required by the FDA to take more precautions against spreading foodborne illness. Heather Craig/ hide caption

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

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