What is an example qualitative observation for childhood obesity?

Childhood obesity is hard to determine, as determining whether they have excess body fat is difficult. It is typically based on BMI (Body-Mass Index).

A child that is obese may eat too much unhealthy food, such as fat food, is at risk for becoming obese. Children with sedentary lifestyles, especially, run the risk of obesity as they are inactive.

Obesity is typically an interplay between genetics and lifestyle, so it isn't easy to find a one true way to identify obesity-- that is, unless the child is already obviously overweight.