Which is fine, but it is again just asking people nicely. People in general don't change their behaviour to prevent long term consequences. You can explain until you're blue in the face how important it is to save your money, exercise, and do your homework, but people do what feels best in the moment. This is especially true of kids and the unintelligent. They only change if they face immediate consequences that nullify that instant reward. Immediate consequences are shame and judgement for overeating. It forces people to adopt behaviour that will reward them later or that at least will benefit everyone else.