Still... A friend of mine developed some heart issues a few years ago. His doctor determined that his drinking 11 cans a day of Diet Pepsi was playing a significant role in that.

I don't know all the details, but he was definitely told he needed to cut back, and doing so helped make the issue go away.

My dentist has also been bugging me recently to cut back my (much more moderate) consumption because it's so bad on your teeth.