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What is obesity?

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Obesity is an excess accumulation of body fat. It is considered a disease because excess fat can result in illness or even death.

According to the National Institutes of Health (NIH), 20 percent or more over ideal body weight is the point at which excess weight becomes a health risk and a person is considered obese.

Obesity becomes "morbid" when it greatly increases the risk of one or more obesity-related health conditions or serious diseases that result in significant physical disability or death.