Measuring the circumference of certain areas of the body makes this method quite simple. The principle governing bioelectrical impedance is that fatty tissue is not as good a conductor of an electrical current as lean tissue. Therefore, the more fat one has the longer it takes for an electrical current to travel through the body. The problem with this method has to do with the hydration of the body. The distribution of fat in the body is dependent largely on gender.
Most women tend to store excess fat around the hips and thighs.
Men tend to store fat around the abdominal area. It is used specifically to estimate critical fat values and to determine potential risk for disease. Determination of BMI incorporates height and weight values. Weight 134 lbs. The only problem with using BMI to measure fatness is in situations when a person has a high degree of lean muscle mass.