Splenda. Also known as sucralose. I've known it was a bad thing since I saw the first commercial with the heavenly little yellow box and the promises of sweetness with no consequence, but I have never taken the time to find facts until now. I know I can't stand the taste of it and that it invariably makes me sick to my stomach. I did the research today. I read plenty of opinions and articles and chemical compounds and barely understandable scientific break-downs. Almost all of them point to the same thing... bad.
I found this article to be most helpful and inclusive.
Splenda or Splen-dud