School lunches are getting healthier, but that alone is not enough to prevent childhood obesity. They need healthy food at home, too. And remember to make sure they exercise.

Dr. Cindy Gellner, pediatrician for University of Utah Health Care says exercise, portion size, your habits and what they're eating at home are important too.

Plus, learn about the 5-2-1-0 and how it can help you have healthy kids.