A kids healthy snacks display at Giant Eagle. Courtesy of Giant Eagle hide caption

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Volunteers at the Maryland Food Bank in Baltimore sort and box food donations on a conveyor belt. The bank started working with groups like the USO in 2013 to provide food aid to families affiliated with nearby military bases. Pam Fessler/NPR hide caption

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Varying speed while walking may make the activity much more effective. iStockphoto hide caption

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An FDA rule effective Aug. 5 states that foods may be labeled "gluten free" only if there's less than 20 parts per million of the protein. James Benet/iStockphoto hide caption

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Although food entrepreneur Tim West's family legacy is in Doritos chips, he wants to shake up the food system — with sustainable, healthful food. Vignesh Ramachandran/Ozy hide caption

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Maria Fabrizio for NPR

Sam Van Aken's grafted fruit trees are still quite young, but this artist rendering shows what he expects the "Tree of 40 Fruit" to look like in springtime in a few years. Courtesy of Sam Van Aken hide caption

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