Why a Body Fat Scale Estimates Fat Instead of Measuring Fat Directly
A home body fat scale can show weight, body fat percentage, muscle mass, water, bone mass, basal metabolism, and visceral fat level within seconds.
That can make it feel as if the scale truly measured your body fat.
It did not. The weight comes from a load cell. The body-composition numbers usually come from BIA, bioelectrical impedance analysis.
The first model is: a body fat scale measures body impedance along an electrical path, then combines it with weight, height, age, sex, and population models to estimate body water, fat-free mass, and body fat percentage.
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