an ingredient in diet drinks ...

Hello, My memory is really bad but I was going to re research this that I had read a while back.
There is an ingredient in diet drinks mostly diet dew...that has been clinically proven ...it causes MS and other illnesses.Sorry I can't remember which and of the others at this time...but it IS and or WILL be the cause. I will try to find out where I read this...of course they don't want US to know the truth. I drink lots of diet dew and have ever since it came out on the market about 15 to 18 years ago...I have progressively gotten worse with ALL kinds of illnesses. Just FYI.
If anyone else knows where to find this information please let me know...I will do some research again too.
sam