AILSA CHANG, HOST:
WW, formerly known as Weight Watchers, has a new app now for kids. It's called Kurbo. The app asks kids to track what they eat and sorts food into good and bad categories without mention of calorie counts. Some experts say this approach could have serious health consequences, including development of eating disorders. At the same time, though, child obesity is on the rise and can lead to medical problems such as high blood pressure and diabetes. Dr. Fatima Cody Stanford specializes in obesity medicine at Massachusetts General Hospital. She joins us now.