Why Does Eating and Drinking Before Measurement Affect Results?

Food and drink may cause temporary changes in weight and impedance. Drinking 1000cc of water will result in a 1kg weight gain. But has this water been absorbed to become part of the body (and thus able to affect impedance), or is it still stored in the stomach? Is undigested food just pure weight?

Temporary weight change will change interpretation of impedance and thus inaccurate results. In addition, it cannot be determined how food affects impedance during the digestion process. Although everyone digests food at a different rate, 2 hours is a general rule of thumb for a certain level of digestion, and thus helping subjects to avoid "measuring immediately after a meal".

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