This has been in and out of the news for years (so long I can't even remember the first time I read it). Basically, NutraSweet/Aspartame/Equal/Spoonful are dangerous to your health! The recent news is a racketeering suit has been filed against some US companies:
Personnaly, I never touch the stuff!

From web link above said:...
For 16 years, the FDA denied approval of aspartame because of compelling evidence of its contributing to brain tumors and other serious disabilities. Donald Rumsfeld, present Secretary of Defense in the Bush Administration, left President Ford's administration as Chief of Staff to become the CEO of aspartame producer G D Searle Co. in 1981. Shortly after, Rumsfeld became the CEO, and the day after President Reagan took office, aspartame was quickly approved by FDA Commissioner Arthur Hayes over the objections of the FDA's Public Board of Inquiry. Hayes had been recently appointed by the Reagan Administration. Shortly after aspartame's approval by the FDA, Hayes joined NutraSweet's public relations firm under a ten year contract at $1,000 a day.
Aspartame/NutraSweet was the product of the G. D. Searle Co. In January 1977, the FDA wrote a 33 page letter to U.S. Justice Department Attorney
Sam Skinner: "We request that your office convene a Grand Jury investigation into apparent violations of the Federal Food, Drug and Cosmetic Act." Skinner allowed the Statute of Limitations to run.
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Personnaly, I never touch the stuff!