A group of teenagers take a morning jog at the Wellspring Academy in Reedley, Calif., in 2009. The school specializes in helping teens and college students lose weight. A new study shows teens who remain obese risk a lifetime of chronic health problems and poverty. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Alex Williamson, 8, is one of 17 million children who live in U.S. households where getting enough food is a challenge. Sometimes it's hard for the poor to eat healthy because it costs more. Pam Fessler/NPR hide caption

itoggle caption Pam Fessler/NPR

Volunteers sorted through food last fall as they stocked shelves at the San Francisco Food Bank in California. As the U.S. continues to struggle through the recession and unemployment is at record highs, food banks are seeing an increased demand. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images