Ayds candies dated from the 60s and 70s and were individually wrapped caramel candies. You were supposed to have two with a hot drink before a meal and supposedly they would curb your appetite, you'd eat less and -- voila! -- be thin. They worked about as well as any two candies before a meal would work, i.e. not at all.
Ayds candies obviously didn't survive the AIDS epidemic.
Who remembers Metrecal, the first liquid diet in a can?