Watch the movie first_
Turns out that this was a real appetite suppressant candy in the late 70's and early 80's, before the epidemic. Sales dropped precipitously in the later part of the decade, as people became familiar with the autoimmune disease by the same name. The company's response? "No problem! We'll just change the name to Diet Ayds."
Somehow, I don't think they thought their cunning plan all the way through.
source: Museum of Hoaxes