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The recent craze of adding caffeine to a range of kid-friendly snack... News PhotoAdolescence,Caffeine,Chicago - Illinois,Child,Food and Drink,Healthcare And Medicine,Horizontal,Illinois,Lifestyles,Possible,Snack,Social Issues,Teenager,USAPhotographer Collection: Tribune News Service 2013 MCTThe recent craze of adding caffeine to a range of kid-friendly snack foods is raising enough concern that the U.S. Food and Drug Administration has launched an investigation of caffeineÕs possible health effects on children and adolescents. (Bill Hogan/Chicago Tribune/MCT via Getty Images)