Aspartame contains phenylalanine (the agent in this study that causes the weight loss problem). So every packet of Equal/aspartame displays a clear warning to

Aspartame contains phenylalanine (the agent in this study that causes the weight loss problem). So every packet of Equal/aspartame displays a clear warning to phenylkenonurics (those who can't digest phenylalanine). No other sweeter bears this warning, and so, should contain no phenylalanine, and will not pose the same threat (to phenylketonurics or dieters).