Who said that for most body was weighed to measure the gap of a week to week? I checked the accuracy of this unit from the previous ... And bam! + 4kg counter (+ 3kg for my wife). Reality is sometimes hard to confront, but it is reality. If the trend measure is needed to assess the effectiveness of measures taken, the starting point is even more important. I have not used the body mass analyzer. The information I found on this type of measure has not prompted me to use this function: the rationale is not clear and interpretation is difficult (one of these days maybe). The aesthetic is very successful and suitable price. So very good product that I recommend.