In this photo taken April 3, 2013, nutrition scholar Professor 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)
What do we eat? New food map will tell us
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