What Jackie said to Caroline.
Did anyone ever say "Nobody will ever want to marry you" to you? What a frighteningly nasty way to try to control someone's behavior! At least Jackie meant well, and it actually is a good idea not to get fat. (If having someone say you're so fat no one will ever want to marry you actually resulted in weight loss, we'd probably be happy to pay someone to say it to us.) Now, when someone says "nobody will ever want to marry you" to warn you off doing something positive, it's another story.
ADDED: Could it be that the reason we've become so fat in this country is that we no longer accept mothers talking to their children like that?