this post was submitted on 05 Sep 2023
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I've heard this before but not sure I believe it. Coffee is mostly water. I think the reasoning is that it will trigger your body to urinate sooner than normal after consuming it. But this won't dehydrate you if you aren't urinating more than what you're consuming.
Is there some reputable source for that?
Edit: Found my own source. Seems like I was correct unless someone can proffer more substantial evidence.
https://www.goodrx.com/well-being/diet-nutrition/does-coffee-dehydrate-you
That's a weird argument to make. Many things are mostly water, like humans for instance. That said, you are more than welcome to experiment and do your own research if you find this implausible.
But you aren't drinking humans or food. You still need to drink water outside of eating. No one would warn you that you could become dehydrated from eating a steak.
Listen mate, I'm not a scientist. If you want to argue whether something does 'x' 'y' or 'z' thing then you really should be going elsewhere. This is a community for ADHD. I gave tips on how I manage my ADHD and some of the drawbacks of my particular method were brought up. I addressed those concerns to the best of my ability. If you would like to learn the scientific exact truth of something then you should be seeking an expert opinion. One that I cannot in fact offer. This is not the time or the place to be debating the qualities of watery-ness
Yet you were the one to re-engage saying it was "a weird argument to make". If you don't know either say so or don't comment. Turns out coffee doesn't dehydrate you. I linked an article in my original comment. It's weird to try calling someone out for an argument you're wrong about, but here we are.
Sea water is mostly water, do you doubt that it dehydrates you?
Salt water extracts water from you because your liver can't process water that salty. So yes you would end up urinating more than you drink. If the same were true for coffee, you'd likely be told to stop drinking it or there'd be heavy recommendations to increase your normal water intake to counter the loss. Technically you could drink salt water as long as you supplement with much more regular water (ignoring the horrifically increased salt intake).
Salt water vs caffeine have very different mechanisms.