Wait, a half a pound? Seriously? There is no need to return to any drawing board for 0.5 of a lb.
Not only could it be water like others suggested, but it could also just be the physical food still in your system. No one 'empties' the exact same amount at the exact same time every day - so a 1/2 lb fluctuation should be completely ignored (unless it happens 10 days in a row).




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