[eric970]

I agree that calories can have different impacts on people. We all require a certain intake of calories to achieve a certain weight or build. There are a lot of different variables that make this happen, such as exercise, lifestyle, genetics, and so on.

But where is the evidence that a calorie-free beverage can have an impact on your metabolism? You're eliminating the idea of calories entirely with diet soda, so I don't see how your argument stands any ground.