Water or green tea! Beware the Coke Zero, its sweeteners are quite harmful, according to some physicists I consulted (and to what happened to myself: got very strong stomach pain for months, and the reason was that I got a reaction to Coke Zero! Switched to Coke Light and it's all gone...)
Did you mean physicians? If not, I would not put much more stock in a physicist's opinion about sweeteners than any other random person's.
yes, I meant doctor, medic... guess it was kinda obvious, no?