DIET COKES NOT THAT BAD. IT DOESNT REALLY HAVE MANY CALORIES IN IT BUT I DUNNO WHAT IT DOES 2 YOUR INSIDES. ALL THOSE SWEETNERS CANT B GOOD 4 YOU. I USED TO DRINK ALOTG OF THAT BUT NOW I DRINK SUGAR FREE ORANGE SQUASH BECAUSE IM TRYING TO DRINK LOTS OF WATER AND I DONT LIKE WATER SO IF YOU PUT SOMETHING IN IT IT DOESNT TAST LIKE WATER