الفهرس 
Definitions and terminologyOnly 14 pages are availabe for public view
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Abstract
Obesity is a condition in which excess body fat put a person at health risk. Excess body fat results from an imbalance of energy intake and energy expenditure total energy expenditure includes energy expended at rest, in physical activity and for metabolism. Obesity is an abnormal accumulation of body fat in proportion to body size. Overweight persons, although still technically obese, have a body-fat proportion that is intermediate between normal and obese. Ideally, an obesity classification system would be based on a practical measurement of body fat that could be performed in the office, would accurately predict diseases risk, and would have application to patients from diverse ethnic backgrounds.
The mostdirect measures of body fat, such as underwater weighing or dual-energy x-ray absorptiometry (DEXA) scanning, are impractical for use in a clinical setting. Indirect estimates of body fat are more clinically practical.