Well if you eat or drink half a ton of artificial sweetener it'll be bad for you (and saccharin can actually cause probs at lower doses, but hardly anyone sticks it in modern products anyway) but providing you don't drink gallons of the stuff or tons of other things, it'll be OK !
I've had 'sugar free' pop all my adult life - I've never drank that much of any of it since I'd rather have a cuppa and I quite enjoy water, when I need to actually quench my thirst, TBH If your blood glucose is running high, then this makes you thirsty (cos the body tries to pee out the excess) in which case, you are much better to drink 'Corporation pop' (as my mom called it!) straight from the cold tap, than anything else at all.