Fluctuations in the rate of hydration, which can be caused by consumption of alcohol, food, sleep, physical exercise, taking medicines or pre-menstruation, can lead to variations in the results obtained.
Other causes that can lead to measurement errors:
- A full bladder
- Severe callous on the heels and soles of the feet
- Dirty soles can lead to conductivity problems
- Wearing nylon (tights, stockings).
*credit to Sylvain of iHealth Labs EU
https://helpcenter.ihealthlabs.eu/hc/en-gb/articles/115005876405-iHealth-HS5-What-could-cause-measurement-errors-