While at doc, a machine with leads was put on arm/foot to tell how hydrated i was, as well as body fat. does it use electric current? is that harmful?

Body Comp Analyzer: No The current is minimal and not harmful at all I am an American Board of Obesity Medicine certified physician and I do this all the time BMI and weight can be deceptive These machines can reasonably tell how much fat , muscle and water you have Muscles help you to have a good metabolism Muscles help you to burn the calories Fat does not In order So a true BMR helps s lot