Diet soda has destroyed my aunt's liver. She went to the hospital for some routine blood work and when the Dr came to see her the first thing he asked was "How long have u been an alcoholic" - my aunt was perplexed, she hasnt drank a drop of alcohol in 20+ years, she told this to the Dr and that all she drinks is water, some tea, and diet coke. The dr told her to quit the diet coke it was on the verge f causing her to have sorosis of the liver.
I haven't touched any soda since she told me this.... That was about 9 years ago.