I can gain a pound or 3 pounds overnight for what seems like no reason - salty foods, eating late, upping my workout, taking meds, flying, traveling, eating different foods and then hormones.
If you are doing what you are supposed to be doing, eventually the weight will come off. When I read "weight gain" I was expecting to read something like a 5-10 pound gain, but a one pound gain? That could be from anything and it's normal.
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