Within a day's time my Tanita scale, which purports to tell everything from BF to lean body mass to level of visceral fat, will give me readings on lean body mass that are 3 or 4 lbs apart. The lower my hydration level (also as measured by the scale), the lower the lean body weight. And of course the BF% goes up accordingly. The most stable reading I get on it is my bone mass. I don't know what technique it uses to generate that, but it changes very little. I would think that, since the BF% and lean body weight readings are so dependent on hydration, having a stomach fle -- very dehydrating -- would really have an impact on what the scale tells you.
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