Leam BM sharp increase

[jeffdm]

Is it safe to assume that when my lean body mass jumps over night that the scale is reading waste in the large and small intestine as LBM?

[whome]

It would depend on which way it jumps. Or due you mean that the waste you eliminate in the morning is seen as NON-lean body mass (i.e. Fat)?

My scale usually shows me going up a percent of body fat overnight and I attribute that increase to dehydration, I wake up thirsty and have urinated overnight but haven't taken in very much water during that time.

[gerrymcd]

The percentage 'fat' shown on scale is based on a measurement of your bodies electrical impedence - muscle contains more water than fat, and therefore conducts better.  Whereas fat, with its low water content, resists the flow of current.  A lower impedence measurement therefore suggests a higher ratio of muscle to fat.  Consequently, this measurement is sensitive to hydration, and liable to give a very different reading at night compared to morning.  

[slysam]

jeffdm, my guess is that you may have been retaining fluids and that is why you saw a sharp increase in lean body mass. The bady fat estimating scales are really responsive to how much fluid is (or isn't) in your body. Technically, water weight is lean mass though. Maybe waste could factor in too. Did your weight also increase?