University of Illinois student Stanley Dayan (from left) and Chabad Jewish Center employees Mordy Kurtz and Yosef Peysin work at the center's kosher food stand in 2013 at the university's State Farm Center basketball arena in Champaign, Ill. David Mercer/AP hide caption

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A poultry processing plant in France. Europe banned treating chicken carcasses with chlorine in the 1990s out of fear that it could cause cancer. Christophe Di Pascale/Corbis hide caption

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The rendering industry likes to call itself the world's oldest recycling system. Nearly 100 percent of processed pigs will eventually get used — as meat and in uses as varied as medicine and pet food. iStockphoto hide caption

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Ready-to-eat meals found in the prepared food aisle are a growing source of waste, as it is difficult to reuse meals that aren't sold but are fully cooked. Kristofor Husted/Harvest Public Media hide caption

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The good old days: A flight attendant serves coffee and sandwiches to a passenger on board an American Airlines flight, circa 1935. Frederic Lewis/Archive Photos/Getty Images hide caption

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Students are given healthy choices on a lunch line at Draper Middle School in Rotterdam, N.Y., in 2012. To keep students from tossing out the fruits and vegetables they're served, researchers say it helps to give them a choice in what they put on their trays. Hans Pennink/AP hide caption

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