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Defining overweight and obesity - children

Introduction

Obesity means having too much body fat. It is not the same as overweight, which means weighing too much. Obesity is becoming much more common in childhood. Most often, it begins between the ages of 5 and 6 and in adolescence.

Child health experts recommend that children be screened for obesity at age 6. If needed, they should be referred to weight-management programs.

Measuring Body Fat

Your child's mass index (BMI) is calculated using height and weight. A health care provider can use BMI to estimate how much body fat your child has.

However, measuring body fat and diagnosing obesity in children is different than measuring these things in adults. In children:

  • The amount of body fat changes with age. Because of this, a BMI is harder to interpret during puberty and periods of rapid growth.
  • Girls and boys have different amounts of body fat.

A BMI level that says a child is obese at one age may be normal for a child at a different age. To determine if a child is overweight or obese, experts compare BMI levels of children at the same age to each other. They use a special chart to decide whether a child’s weight is healthy or not.

  • If a child’s BMI is higher than 85% (85 out of 100) of other children their age and sex, they are considered at risk for being overweight.
  • If a child’s BMI is higher than 95% (95 out of 100) of other children their age and sex, they are considered overweight or obese.

Review Date: 10/25/2010
Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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