I quit my Diet Coke habit cold turkey about a year ago. I used to be a pretty serious addict. It didn't stop at Diet Coke either - I was pretty involved with Diet Dr. Pepper and Diet Orange Sunkist too. I used to think, it's "diet." It has no calories. It can't be bad for me. But, more and more, I'd hear people say that soda - even diet soda - is horrible for your body. And I kind of took that general sentiment at face value when I decided to quit. Today, I'm 100% soda free and I feel great.
If you've been flirting with the idea of giving up soda, but are looking for a more concrete reason than just "soda is bad for you," check out the 7 side effects of soda below. And, by the way, I wholeheartedly agree with #2 - quit soda and you just might find that you're not as hungry anymore.