A member asked:

How can a personal scale measure body fat and muscle mass?

A doctor has provided 1 answer

Scales: Digital scales purport to measure your body fat through a process called bia, or bioelectrical impedance analysis. Essentially, it clocks the speed that electricity travels through you. The scale runs a low-level electric current through your body, using your feet as positive and negative electrodes. The current encounters different levels of impedance, or resistance, from fat versus muscle.

Answered 4/14/2013

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