this post was submitted on 10 Jan 2026
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...because the shape of the water bottle isn't uniform either. Part of my new year's resolution is to drink 4 liters of water per day, so I spend a lot of time looking at those lines. Edit: 4 liters is a lot, but appropriate for my size and activity level. Without conscious consideration I don't drink enough water. It looks blue because the bottle is blue.

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[–] sem@piefed.blahaj.zone 2 points 18 hours ago (1 children)

https://www.rd.com/article/is-coffee-a-diuretic/

A lot hinges on the definition of diuretic. Does it mean, "makes you pee more often/more volume?" (In which case water is a diuretic) or does it mean it dehydrates you? (In which case water is not a diuretic).

That is my understanding of it anyway.

[–] spankinspinach@sh.itjust.works 1 points 12 hours ago (1 children)

Oooh I love readers digest.

I agree it is based on the definition, and honestly it sounds like we might be arguing two sides of a similar point: I'm focused on the drug action (caffeine as a diuretic), you're focused on the actual beverage (coffee as a hydration drink).

Thanks for the great discussion :)

[–] sem@piefed.blahaj.zone 1 points 9 hours ago (1 children)

I don't agree with your characterization of the discussion. My understanding was that caffeine the drug irritates the badder and causes you to pee, but doesn't actually dehydrate you.

[–] spankinspinach@sh.itjust.works 2 points 8 hours ago* (last edited 8 hours ago) (1 children)

That's fair, I'm sorry if I put words in your mouth.

If I'm understanding you, you're focusing on how it's affecting you to increase urination, right? I know nothing about bladder irritation - you could be right, for sure.

My only contention with increased pee volumes is that if you're peeing, you're losing water, so if caffeine is increasing urination, it's dehydrating you, regardless of how it's coming about, no? Is there a part of your point I'm not getting?

Where I'm sitting: caffeine as a drug is a diuretic and causes dehydration in high enough volumes, but caffeine does not appear in strong enough concentrations in drip coffee to cause dehydration. So, coffee is a hydrating drink, but because water outweighs the dehydration impact of the caffeine, rather than caffeine is not a diuretic.

[–] sem@piefed.blahaj.zone 1 points 6 hours ago* (last edited 6 hours ago)

As I understand it, your bladder collects urine, which is water and waste products. Your body, your kidneys, etc, are always trying to maintain a Goldilocks level of hydration. If you drink a lot of water, your body removes the water from your bloodstream and puts it in the bladder so you can pee it out. That way you don't get overhydrated. If you're underhydrating, you will still have to pee eventually to void the water soluble waste products in urine, like uric acid. And if you don't replenish this you'll get dehydrated.

As I understand it, alcohol dehydrates you -- it removes water from your bloodstream and into your bladder, which gets full and causes you to pee. Your electrolytes get more concentrated, and your muscles are less effective. Your body doesn't have the water it needs to properly function unless you drink more water.

Caffeine on the other hand does not dehydrate you this way. What it does is irritate your bladder, causing you to void whatever was in there before you would otherwise need to, but not affecting your electrolyte balance in your blood.

So while both are "diuretics" in the sense that they make you pee, only one is dehydrating you, and is a "diuretic" in that sense.