Obesity is an epidemic of epic proportions for today's youth. Just walk around a local shopping center or visit a high school (any high school) and you'll be astounded at the size of today's teenagers. It's really scary what the future holds for these kids. Why are they doomed? Because obesity kills so slowly that by the time it's taken over the lives of these kids, they're often too far down the path to recover their health. Serious and drastic measures can be taken to "fix" these kids, but damage to the cardiovascular system has already been done -- and the carbs have won the day.
Take what you've learned about improved health and fitness and find one, just one, kid to help. It could be your own, a relative, or a mentee. Check out THIS ARTICLE from the NY Times on how waist size helps predict heart disease in teens.