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How do smart scales measure body composition, and how accurate are they?

Live Science
Summary
Nutrition label

66% Informative

Smart scales are not just for fitness enthusiasts and can benefit a wide range of population groups.

They are not as accurate as clinically validated diagnostic methods, such as the “gold standard” Dual Energy X-ray Absorptiometry ( DEXA ), which uses rays of ionizing radiation to penetrate the body and produce images of bones and soft tissues inside.

Some of the best smart scales on the market can give you an in-depth explanation of your health stats and offer basic diet advice.

How and when you take measurements may also affect the accuracy of your smart scale’s readings.

Dehydration, excess body water and even skin temperature may alter electrical resistance in the body.

High-end smart scales use multiple frequencies of electrical current to improve accuracy.