What is bioelectrical impedance?

Bioelectrical impedance (BEI) is a portable and non-invasive way of estimating body fat percentage.  This could be in the form of a handheld instrument, a scale that you stand on barefoot, or small electrodes that are linked to your hand and foot.  BEI involves conduction of a small electrical current through the body to measure fat percentage, based on the speed of conduction.  Lean tissues have higher water content and less resistance to the current than adipose tissue.  Some BEI devices will measure fat mass, fat free mass, and even total body water.

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