re: How is it that you can lose weight while you sleep?

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I get that, but 2-3 pounds?

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I know a woman's weight can fluctuate during menstration due to water rentention/etc by almost 6-7 pounds. As others have said, it's anything from absorbtion to sweating. You also have to account for meds you're taking or supplements that maybe dehydrate.

I will say it's not good to weigh yourself every day like that because of those daily fluctuations. You're better off weighing once a week at the same day at around the same time.