How can a scale tell you your body fat percentage and other things about you without a blood sample?
In: Biology
The scales that have this ability have a few electrodes that contact your skin. Bone, muscle and fat have different electrical properties. By sending various small currents through your body the scale is able to measure these properties. So it can roughly tell how much fat there is compared to muscles and bones. It is not accurate enough to be used in any medical sense since there are so many different variables that affect the measurement. But if you follow the user guide exactly and happens to be a upper middle class white man in your 20s or 30s living in California the results are surprisingly accurate.
Latest Answers