In this photo taken April 3, 2013, nutrition scholar Prof. Barry Popkin, who heads the University of North Carolina Food Research Program, poses for a photo in his Chapel Hill, N.C., office. Popkin ... more 
In this photo taken April 3, 2013, nutrition scholar Prof. Barry Popkin, who heads the University of North Carolina Food Research Program, poses for a photo in his Chapel Hill, N.C., office. Popkin and researchers he leads are creating a gargantuan map of what foods Americans are purchasing in stores and eating, something he calls "mapping the food genome." "The country needs something like this, given all of the questions about our food supply," he says. (AP Photo/Gerry Broome) less 
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Associated Press | Photo By Gerry Broome
Sun, May 19, 2013 1:44 PM EDT