Originally Posted by MariaMaria
Wouldn't you _have to_ be drinking water for the scale to measure higher? You can't create mass from nothing.
I can't wrap my head around it, either, but for me, it happens without fail. I've encountered similar issues to do with weight gain and water retention, too...for example, weighing myself, eating 1 lb of food and weighing myself immediately afterwards to discover that I'm 2.5 lb heavier (as per Easter dinner this year). ...or, a condition I sometimes experience due to a health condition ("IC Belly") which has me gain 3-4 pounds in swelling without anywhere for the weight to come from!
I'm guessing that it has to do with water being retained instead of its normal evaporation, but that seems like a lot of weight in a short period of time. I'd be interested to know the science behind this.