"Gluten Free" appears on the packaging for a bag of Frito-Lay Inc. Lays brand potato chips displayed for sale at a supermarket in Princeton, Illinois, U.S., on Wednesday, Aug. 7, 2013. The Food and Drug Administration (FDA) is issuing a final rule to define the term "gluten-free" when voluntarily used in food labeling, according to a notice published in the Aug. 5 Federal Register. Photographer: Daniel Acker/Bloomberg via Getty Images
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