Jordan send me this article recently. It seems that people that drink diet soda have a higher chance of developing diabetes than people that drink regular soda:

Both diet and sugar-sweetened beverage consumption was linked with a higher risk of developing diabetes, researchers found. But interestingly enough, when comparing diabetes risk between the diet soda drinkers and regular soda drinkers, the diet drinkers had an even higher risk of diabetes.

Meanwhile, the women who only reported drinking 100 percent juice did not have an increased risk of diabetes, according to the study.

Diet Soda Associated With Higher Type 2 Diabetes Risk, Study Finds