It must be a defective unit, I've been seriously cutting cals, measuring and weighting foods for a week now. I've had to tighten my belt one notch since I started, and according to the scale I've lost just about 2 lbs but body fat is the same?!?!? I've been tracking calories with an app on my phone, imputing food and calories and keeping daily calories to right around my bmr, or even a couple hundred under bmr. Could I have lost enough muscle around my waist in a week to need to tighten my belt, that doesn't seem right to me,