$1:
Back in the old days, when beer was first made, it was made because the water was absolutely filthy. They couldn’t drink the water because they’d get all sorts of nasty diseases. By adding alcohol it meant that a lot of the bacteria was killed.
Beer in the old days was very mild. It was maybe half a percent, so you could basically drink it all day long without it having much of an effect, much like shandy that you buy now in a tin can.
Modern Beer
Modern day beer is a lot stronger than that. The average beer nowadays is 4 or 5 percent. So the answer to the question “Does it hydrate or dehydrate you?” is that it actually dehydrates you.
It’s actually thought that if you drink 200 ml of beer, that you don’t just urinate 200 ml of water. You actually urinate 320 ml of water, which is a 120 ml of dehydration.