This is just my opinion. But I say as long as you can keep it moderated to 1 to 3 cans a day. I don't think that is to much.That is only 21 cans per week if you drank 3 everyday. My dads ex wife would drink a 12 pack a day of diet coke. Now that to me is an addiction to diet coke. The worst thing for you in the diet coke is the aspartame and the acidity of the diet coke. Just my .02 cents