In the United States, overweight and obesity among all groups—particularly children and adolescents—have greatly increased over the past quarter century. Excess weight has become an epidemic, causing serious health problems for millions of people.
Obesity is the accumulation of excessive body fat. It is defined by a measure called “body mass index” or BMI. BMI is calculated using this equation: BMI = your weight in pounds divided by your height in inches squared, multiplied by 703.