The org I work for teaches exactly these kinds of classes for kids 12 and under, and you have NO idea how much these kids want to learn how to eat and exercise and not be fat anymore. No matter what their ham parents tell them, they know being fat is unhealthy and undesirable. Even home schooled kids know it based on the way people react to them in public. It breaks my heart to see them listening so intently and running things their parents say by us that don't sound right to them about food and exercise.