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Obesity (oh-BEE-si-tee)
Having a high amount of body fat. A person is considered obese if he or she has a body mass index (BMI) of 30 kg/m2 or greater.

Overweight
Too heavy for one's height. It is defined as a body mass index (BMI) of 25 up to 30 kg/m2. Body weight comes from fat, muscle, bone, and body water. Overweight does not always mean over fat.