Well, it isn't marketed as higher caffeine, so that kind of a reason is out. Few people would be able to notice such a difference anyways. Technically, it would be beneficial to have more caffeine in a diet drink to encourage people to burn off more calories. read more
Diet cola drinks contain higher levels of caffeine than regular versions, according to new research. Caffeine is linked to hyperactivity in children, however manufacturers such as Coca-Cola, Pepsi and energy drinks companies are not required to label levels in their products. read more
Diet Coke was created in 1982, and it used a totally new formula compared to Coca-Cola classic. In fact, the infamous"New Coke" was based on the flavor profile of Diet Coke. The caffeine content difference is probably due to the new flavor profile. Caffeine itself is sometimes used a bittering agent in drinks like root beer. read more