Active Low-Carber Forums - View Single Post - Is 100 lbs. 'lean body mass' normal?

You must understand that hose scales or even calipers, can not really measure correctly the % body fat...
What these scales can do is measure progress over time, and even that is kinda iffy.. These scales use electrical resistance of the body and the theory goes that the more fat you have, the more water you store in it, the lower the electrical resistance of your body... It is not accurate.. measuring before or after exercising, or before or after a shower can skew the results significantly..

The only accurate absolute measurement of of % body fat, is done by immersion in water, and comparing the amount of water displaced with you weight.. (think Archimedes)..

So, I would not get too excited about the numbers this scales show.. You could use it to measure progress, but even for that it is not that great...