The only true measurement of the amount of fat in the body is by chemical analysis of cadavers.

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Chemical analysis of cadavers is the only accurate way to measure body fat because it provides a complete analysis of all the body's tissues. Other methods, such as body mass index (BMI) or skinfold testing, can give estimates but are not as precise. However, this method is not practical for living individuals, and alternative methods, such as bioelectrical impedance analysis or dual-energy x-ray absorptiometry (DXA), are used instead.

The Only True Measurement of the Amount of Fat in the Body