'Water weight'

Any gym / fitness / diet people who can explain this to me? Like the whole concept / truth of it.

Because I know weight can fluctuate, and this is a reason. But also we're supposed to consume however much water in a day (8 glasses)? So it is good for you and has no calories, but also it makes us heavier?

Last week during a huge heatwave in the UK I was lighter and an inch smaller around my middle, I assume this was partly due to how much I was sweating 😅 And I know boxers, bodybuilders, jockeys etc can 'lose' pounds of weight from sweat before a weigh-in.

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MrEMann · 51-55, M

I actually thought "water weight" was the body's retention of extra water from improper hydration. So, if one doesn't drink enough water, the body retains as much water as it can in reserve. And once you start drinking regularly, the body will allow itself to let go of that excess water. I might be wrong on that though. Oh, and you can't hydrate with beer! lol! Been there, done that, got the tee shirt!