John Umland (left) and John Torrens gather donated cans of food in 2011 in Rohnert Park, Calif., for the group Neighbors Organized Against Hunger. Hunger advocates say a lot of nutritionally dense food like canned tuna and beans can be cheaper than processed food. Kent Porter/ZUMA Press/Corbis hide caption

itoggle caption Kent Porter/ZUMA Press/Corbis

Volunteers pass out fresh vegetables for a Thanksgiving meal at the Alameda Food Bank in Alameda, Calif., in 2009. The percentage of Americans who report struggling to afford food has remained stubbornly near recession-era highs. Justin Sullivan/Getty Images hide caption

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Homeless advocate Arnold Abbott, 90, director of the nonprofit group Love Thy Neighbor Inc., prepares a salad Wednesday in the kitchen of The Sanctuary Church in Fort Lauderdale, Fla. Abbott was recently arrested, along with two pastors, for feeding the homeless in a Fort Lauderdale park. Lynne Sladky/AP hide caption

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The homeless and others in need enjoy lunch at the Los Angeles Mission on Nov. 23, 2011, in celebration of Thanksgiving. Legislation to ban organizations from serving food to homeless people in public places has been proposed in Los Angeles. Frederic J. Brown/AFP/Getty Images hide caption

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People shop in a Miami grocery store on July 8. USDA says that despite the drop in unemployment, the number of food insecure Americans has not declined because higher food prices and inflation last year offset the benefits of a brighter job market. Joe Raedle/Getty Images 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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Shabazz Napier of the Connecticut Huskies speaks to the media in the locker room after defeating Kentucky in the NCAA men's championship on April 7. Jamie Squire/Getty Images hide caption

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Food banks have become a primary source of nutrition for rural farmworker communities in the Central Valley. Scott Anger/KQED hide caption

itoggle caption Scott Anger/KQED

A mural in the isolated city of Iqaluit, in Canada, where food insecurity is tied up with native culture, poverty, and high food prices. ascappatura/Flickr.com hide caption

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This Panera Cares store in Chicago switched from for-profit to nonprofit this summer, and it started asking customers to pay whatever they want. Niala Boodhoo for NPR hide caption

itoggle caption Niala Boodhoo for NPR