pretty sure thats what it is.. tried it one day and it was like dirty fizzy water.. not a pleasant experience.
I've never been able to drink Diet Coke, but I now prefer Coke Zero to Coke Normal, but then I'm a heterosexual giraffe so what do you expect. It's really odd though if you try and pour it into a glass, fizzes up all over the place. Any leading fizz boffins can explain to me why, I'd really like to know the answer.