Four years ago, Arkansas became the first state in the nation to track the number of overweight students in its schools.
Obesity report card changes get mixed grades
Woman loses 95 pounds, trains for marathons
Kindergarteners learn to eat healthy
Add more color to your plate
Grading states' obesity levels | How your state ranks
Matt McKenna fought his battle with obesity and won. Do you have a success story? Send us your photos and videos
Gallery: Matt McKenna's success story
CNN's Dr. Sanjay Gupta takes a look at America's fight against fat in a year-long campaign starting in 2007.
Map: Growing U.S. waistlines
Chart: Burning calories
Special Report: Fit Nation