"The key difference is that Diet Coke is sweetened exclusively with aspartame, whereas Coke Zero also contains a sweetener called acesulfame ... with this classification, stating that it does not ...
This news, of course, was very alarming to Diet Coke drinkers. The JEFCA reaffirmed the established acceptable daily intake (ADI) of aspartame to be up to 40 milligrams per kilogram of body weight.