Obesity is a chronic condition that develops when energy intake exceeds energy expenditure, resulting in excessive body weight. Medical opinions concerning obesity have shifted in recent years. In the past, it was thought to be a 'lifestyle' disorder - a result of overeating and lack of exercise. Today, medical experts recognize obesity as a disease that manifests serious co-morbidities if left untreated.
Although the true cause of obesity remains unclear, medical and scientific evidence suggests that it results from dysfunctional biological mediators of weight regulation. Contributing factors are a genetic predisposition, aging, and sociocultural and/or environmental influences such as the excessive intake of dietary fat and the low levels of physical activity typical of the affluent lifestyle of the industrialized World. | 
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