if you had lost 2 pounds of fat last week
but had low water content in your body the first monday and higher water content the following monday (a difference of 2 pounds is easy to have from day to day) then that could account for a zero pound difference. and salt can cause the body to retain water too. other sources of weight fluctuations have to do with what's located or not located down past the tummie tum tum
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best to look at long term averages over say, from month to month.