The number of overweight children in the U.S. is climbing. According to the Centers for Disease Control and Prevention, the prevalence of overweight among 6- to 11-year-olds has doubled over the past 20 years. Among those 12 to 19, rates have tripled. Today, nearly 19 percent of children 6 to 11 are overweight and more than 15 percent are obese. Among the 12- to 19-year-olds, more than 17 percent are overweight and 15 percent are obese.