Pepsi announced today that it will be removing aspartame from some of its Diet Pepsi drinks, effective this August. Affected by this change are Wild Cherry Diet Pepsi, as well as Regular and Caffeine-Free Diet Pepsi — but not Diet Mountain Dew. Since 2013, Diet Pepsi flavors have been artificially sweetened using a blend of aspartame and acesulfame potassium (also known as ace-K). The new Diet Pepsi formulation will now be sweetened with ace-K and sucralose. Though some consumers worry about aspartame's health effects, Seth Kaufman, senior vice president of Pepsi and of flavor, denies this was a driving force in the company's decision to remove the chemical. In a phone interview with USA Today, he instead attributes the decision to changing consumer preferences: "Decades of studies have shown that aspartame is safe. This is not about safety."