In this photo taken April 3, 2013, nutrition scholar Prof. Barry Popkin, head of the University of North Carolina Food Research Program, poses for a photo in his office at UNC-Chapel Hill. Popkin is ... more 
In this photo taken April 3, 2013, nutrition scholar Prof. Barry Popkin, head of the University of North Carolina Food Research Program, poses for a photo in his office at UNC-Chapel Hill. Popkin is leading a massive project of researchers who are studying what foods Americans are purchasing in stores and eating, and creating a gargantuan map, something he calls "mapping the food genome." "We're interested in improving the public's health and it really takes this kind of knowledge," 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