weight gains

Today my friend asked me what's the reasoning behind weight jumps and we couldn't find the answer. So I'm curious and want to find reasoning behind it. In the morning she weights 54kg and 57kg in the evening. Ofc it should be higher in the evening but not that much. Especially if she eats...

Hello all, Been reading the forum for some time and got some great insight and info so it was the first place I thought of with my question/issue. I'm 49, 5'10" 200lbs. not sure BF% but exceptable for an old guy. Been lifting on and off my whole life but hard and dedicated the last eight years...