The data may be inaccurate if you suffer from the following conditions: Fever, hangover, exhaustion (after heavy exercise), overheating (after bath or sauna), your posture may be wrong. As there is a minor current passing through the body when you step onto the scale, people in the following conditions are not advised to use it: pregnant women, people with surgically inserted pacemakers, artificial dialysis or other medical devices and those suffering from edema.