Four different carbonated beverages were tested, water was used as a negative control, and 2 milks (white and chocolate) were used as positive controls, bringing the total of tested beverages to 7. The beverages, their composition, and pertinent characteristics are shown in Table 1. Two of the beverages (Coke and Coke-Free; The Coca-Cola Company, Atlanta) included phosphoric acid as the acidulant and 2 (Mountain Dew; The Pepsi Cola Company, Purchase, NY; and Sprite; The Coca-Cola Company) used citric acid. Two provided caffeine (Coke and Mountain Dew) and 2 did not (Coke-Free and Sprite). The brands studied were chosen because their contents of the putatively harmful agents were toward the high end of their categories.
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