In 1990 I had a physical in the Air Force and while waiting in the flight surgeons office I read an article about aspartame (nutrasweet) discussing the complications that can occur from ingesting nutrasweet. This was an official Air Force publication.
It went on to say it can cause vision and memory related problems and warned that people in the position to make command decisions, especially pilots, should not use any products with aspartame in it.
Since then I have done a lot of research on nutrasweet and can't believe it's being put in more and more products instead of being banned. Basically for the producer of consumer goods (ie Pepsi, Coke, etc.) it's cheaper because it takes so much less to sweeten their products and that increases profits.
So follow the links and search the major search engines to make your own decision about nutrasweet.