Your body wants to flush alcohol out of your system before it poisons and kills you. It is a diuretic, which means it makes you pee more.
That said, a lot of times that effect is overblown. You might head out for a beer after work, drink it, then nature calls and you’re off to the loo and you think ‘ha ha broken the seal’.
Actually, you weren’t particularly thirsty before leaving work and hadn’t been to the toilet in a few hours. Drinking a couple of pints of anything at that point would have made you need to wee. You need to drink more than a couple of pints of beer before the alcohol content is the leading cause of urination, and not the fact that you’re drinking large amounts of water when you’re not thirsty.
I can’t give a real scientific reason because I’m dumb af but I do believe it’s because alcohol is a poison and when your kidneys filter your bloodstream the majority of the alcoholic drink immediately gets filtered for expulsion through urination because your body is trying to get rid of the toxins as soon as possible. It’s definitely not because it boosts your digestive system like caffeine
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