Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pepsi ONE (so named because it contains one calorie per eight-fluid ounce (230 ml) serving) is a sugar-free cola, marketed by PepsiCo in the United States as an alternative to regular Pepsi and Diet Pepsi. On June 30, 1998, the artificial sweetener acesulfame potassium (Ace-K) was approved for use by the Food and Drug Administration. PepsiCo responded within one hour, announcing the introduction of Pepsi One (which reached store shelves the following October). This new variety was based upon an earlier product (sold in other countries) called Pepsi Max, but it featured a formula and flavor profile developed specifically for the U.S. market.