Nearly 4 million kids are now considered "severely obese," according to the American Heart Association.
About five percent of 2- to 19-year-olds have earned that label.
Being severely obese raises the risk of type 2 diabetes, heart disease, high blood pressure, and other weight-related health problems.
It also makes it harder to lose weight through traditional methods like diet and exercise.
Health officials recommend starting early by limiting fast food and sugary drinks and increasing exercise before the problem becomes so severe