“Sucralose is almost certainly safer than aspartame,” says Michael F. Jacobson, executive director at the Center for Science in the Public Interest, a Washington, D.C.-based think tank. Diet Pepsi will still contain another FDA-approved artificial sweetener — acesulfame-potassium, or ace-K — which some researchers have said needs further testing and research. “The fact that Diet Pepsi will be specifically marketed as ‘aspartame free’ is a blunt acknowledgment that consumers have soured on aspartame and the new cans should increase consumer awareness even further and spur other food and beverage companies to abandon it, including Diet Coke.”