The CDC would be happy with these guys, who were playing in Birmingham, Ala., in July 2013. Teenage boys say basketball is their favorite activity. Mark Almond/AL.COM /Landov hide caption

itoggle caption Mark Almond/AL.COM /Landov

Playing outside can help kids — and their parents — maintain a healthy weight. iStockphoto hide caption

itoggle caption iStockphoto

Students at Lowell High School in Michigan sit down for lunch. Shorter lunch breaks mean that many kids don't get enough time to eat and socialize. Emily Zoladz/Landov hide caption

itoggle caption Emily Zoladz/Landov

Just knowing that someone is obese doesn't mean they would benefit from bariatric surgery, doctors say. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Teenagers put in more than two hours a day of TV time on average, still more than what pediatricians say is healthy. iStockphoto.com hide caption

itoggle caption iStockphoto.com

A poll needs to ask about randomly selected children in households across the country to bring context to what's happening with kids like 7-year-old Henry Condes in Los Angeles. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

A new poll explores what happens in American households during the hours between school and bedtime. Image courtesy of The Bishop family (left), The Benavides family (top right), NPR (center) and The Jacobs family (bottom right) hide caption

itoggle caption Image courtesy of The Bishop family (left), The Benavides family (top right), NPR (center) and The Jacobs family (bottom right)

Kathy Del Tonto (far right) participates in a class that teaches school cafeteria workers how to prepare meals from scratch. LiveWell Colorado hide caption

itoggle caption LiveWell Colorado

An overweight child reads her part during a skit that was in a 2010 program promoting healthy lifestyles sponsored by Children's Hospital near Denver. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

When they eat out at a restaurant, kids consume more calories than they do at home. Here, members of the Long Island Gulls hockey team enjoy a lunch at TGI Friday's back in 2007 in Marlborough, Mass. Bruce Bennett/Getty Images hide caption

itoggle caption Bruce Bennett/Getty Images

Canned food is a source of BPA exposure, but researchers aren't sure whether it causes childhood obesity. Above, the soup isle at a grocery store in Washington, D.C. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR

Childhood obesity is on the rise in many countries and overuse of antibiotics is now on the radar as a possible factor in the epidemic. Here 18-month-old twins are weighed in a nutritionist's office in Colombia. Raul Arboleda/AFP/Getty Images hide caption

itoggle caption Raul Arboleda/AFP/Getty Images