The chemicals in any soda, diet or regular are pretty bad on your liver/kidneys....if one drinks them everyday. Myself, I "love" Diet coke, but the problem with any "sweetener", real or substitute, is your body treats it like suger, increasing your insulin levels,etc. This really puts your bloodsugar through the wringer, plus the caffeine in the soda ramps up your adrenal gland to where it pumps out more cortizol than adrenaline. How big is your belly now?
Now, like anything else, "moderation" negates about 99.99% of the worst effects. ha.
Enjoy your life, just be smart about it. I lay off coffee/pop from time to time...let my oragns "rest" awhile, ha.