I was looking on the net when I stumbled across the following website:http://www.dorway.com
It's a very interesting site regarding the dangers of consuming products containing aspartame (sweetener used in diet products).
In the links section of the above site was this site:http://www.sweetpoison.com/
This site is easier to follow, so you may want to give this one a go first.
After reading it, you'll never consume another mg of aspartame again.