Obesity is defined as excessive fat accumulation, but not overweight. Usually normal body consists of 82% lean body mass, which is essential for maintaining life and physical activity, and 18% body fat, which act as energy store for urgent situation. Thus, obesity is over storage of body fat.
According to the definition of obesity, we should estimate obesity by fat measurements. There are many methods to measure body fat, however at present, we don´t have any methods which enable us to measure body fat, easily, accurately and costless-
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