A customer shops for produce at the Hunger Mountain Co-op in April 2013 in Montpelier, Vt. More than a dozen food cooperatives supported the bill that would require the labeling of genetically modified foods. Toby Talbot/AP hide caption

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A woman shops at a supermarket in New York City. Spencer Platt/Getty Images hide caption

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Allen Williams grows corn and soybeans for Clarkson Grain, which has been selling GMO-free grain to Japan for years. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR

After Grist's six-month-long series on genetically modified foods, some loyal readers accused the site of changing directions in the debate. iStockphoto hide caption

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Soon after being sliced, a conventional Granny Smith apple (left) starts to brown, while a newly developed GM Granny Smith stays fresher looking. Courtesy of Okanagan Specialty Fruits Inc. hide caption

itoggle caption Courtesy of Okanagan Specialty Fruits Inc.

Labels on bags of snack foods indicate they are non-GMO food products. Robyn Beck/AFP/Getty Images hide caption

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Genetically modified to be enriched with beta-carotene, golden rice grains (left) are a deep yellow. At right, white rice grains. Isagani Serrano/International Rice Research Institute hide caption

itoggle caption Isagani Serrano/International Rice Research Institute

An Argentine farmer stands by his field of trangenic soy, designed for resistance to drought and salinity. Juan Mabromata/AFP/Getty Images hide caption

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Farmer Richard Wilkins, a firm believer in genetically modified crops, examines the corn crop at his farm in Greenwood, Del. U.S. and EU officials begin talks Monday on an ambitious free-trade agreement. One stumbling block is agriculture. Unlike the U.S., the EU bans the cultivation of genetically modified crops. Jackie Northam/NPR hide caption

itoggle caption Jackie Northam/NPR