STOP Drinking your diet soda and spit-out that sugar-free gum. Go Here and Read This...
It's quite long but you'll get the idea after reading PART ONE...
If you want to know more, this is also a good book on the subject
Sweet Deception, by Dr. Mercola
Aspartame:
"In a 1996 survey, Ralph G. Walton ... looked at 166 peer-reviewed
studies on aspartame undertaken between 1980 and 1985. He found that all
74 of the studies funded by the industry found no adverse effects from
aspartame, while 84 of the 92 independently funded articles did find bad
effects." – Money & Politics