Parenting and Food

The New York Times has an interesting article on parenting and food and how little useful information actually exists concerning this. As a parent with 3 children of my own, I'm often stymied with how to impart good habits to them. My 'Tween eats more than any two people at the table, and I'm rightfully concerned that he'll have similar issues to me when his metabolism eventually slows. Chef Laura is documenting her own weight issues at 45 by 45. How do you deal with diet and exercise with your children?