ST. PAUL, Minn., May 13 (UPI) -- Consumers might notice more people these days taking cellphone photos of products on supermarket shelves. What they actually are doing is checking those products via their bar codes to determine how healthy or unhealthy they are. Such checking clears away the haze of advertising and label claims and gets down to the basic question: Is this product nutritional or safe or is it potentially harmful? The soaring popularity of smartphone apps that scan barcodes on

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