3 liters everyday actually to keep muscle and brain work properly.

200ml every waking hour?

Seems excessive.

Why

A few big sips.

it's a matter of habit. 3l of liquids per day is what various doctors in different (european) countries have recommended me over the years.

Are we sure this is not just harmless and arbitrary information being parroted? Do we have verifiable sources other that anecdote? I find it hard to believe that there is just a single value for water intake across the massive biological spectrum that is humanity and expect to see a range when this conversation comes up. You're also getting water from foods, which I am sure is not being accounted for. Reminds me of the 10k steps a day that just happened to be "correct enough" to be believed and acted on. The truth is much more nuanced and depends on a number of factors in a person's physical health.

Without concrete verifiable findings, the best we can do is learn to pay attention to our bodies and drink maybe a little bit more water than we think we need to.

Overdrinking water is an American mania. You don't need to drink 3 liters.

https://abcnews.com/Health/Wellness/waterlogged-america-drin...

The European doctor quoted certainly said "3 liters" from both drinks and food (especially vegetables). In Europe I think we drink between 1 and 2 liters per day in actual water, depending on how dry the weather is.

Americans don't eat vegetables though

They also eat plenty of salty processed foods.

Which helps with water retention, so...

Agreed. Being in the Midwest US, my intake also varies widely, depending on weather or season, physical activity, and the foods I've been eating.

I'm not entirely dismissive of doctors, be they European or American, as most I've encountered do have the patient's best interest at heart. But they are also human, and it is very easy to stick with the safe and easy answer rather than do the work to find the real answer. So when I hear claims like that, I immediately doubt them, assuming it is placeholder information because we do not know the actual answer. Unfortunately, a lot of our media in the US considers such "placeholder information" to be actionable, and ends up convincing the public (including doctors) of its veracity.

European recommendations:

https://www.eufic.org/en/healthy-living/article/how-much-wat...

I always laugh about those ridiculously large water bottles American carry and how they remind you all the time that you must drink water as if I did need it. I wonder why that happens.

I’ve always been extremely suspicious of constant water consumption. No other mammal seems to do this. Even the ones that require a lot of water like horses will only drink when they’re thirsty or while eating.

The point is you shouldn’t wait to drink until you feel thirty. That’s too late. Your muscle has been consumed by then.

Its aggravated because the "water sensor" appears to fail early with age. Elderly people tend to not get the thisty feeling as often, but get dehydrated anyway.

Indeed. That’s why I form the habit to drink 3 liters everyday to keep my urine white transparent.

I wonder how much of the effects of ageing are due to cascading failures downstream of alterations like these. For example, it's common for people to lose teeth in advanced ages. How much of this is due to dry mouths from insufficient water intake? Fallen teeth then may become entry points for infections, et cetera. Perhaps fixing a few early causes we can avoid a lot of negative effects and live more, without the need to go full spartan in lifestyle discipline.

I don’t know the exact things. I only know that diabetes would make this loss tremendously. As to teeth loss, it’s mainly because periodontitis but not age though it always goes worse as the age increases because of their life behaviors.

No other mammal eats cooked or baked food. Raw meat or raw plant contain more water than our food.

Tl;Dr blame Gatorade marketing.

The book "waterlogged" does a good takedown of the myth. Basically only you need to drink when you are thirsty.

Most other animals have typical lifespans that don't top two decades.

sure, there are different recommended amounts, the EFSA recommendations are 2.5l per day for a grown up man and 2l for a woman[0]. I'm a bit bigger than the average so I got 3l as a recommendation when I was on a diet or when I had specific issues.

But I didn't mean to imply everyone should drink it, just that it's not hard to drink that much. And yes, of course you ingest a lot of water through other means too.

[0] https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2010...

It’s a glass of water an hour. Hardly excessive.

It doesn't do anything to drink so much water. It is a purely American myth/trend.

https://abcnews.com/Health/Wellness/waterlogged-america-drin...

I feel much better when I drink more water: head, eyes, and body. And if I don't drink enough water during the day I'll cramp at night. Drinking lots of water to lose weight is nonsense – on this I agree.

I bet that your body needs more water if you eat ungodly amounts of salty processed food, just to flush all that shit out again.

I have a bottle of 2.5liters. One bottle of water everyday from 7am to 8pm. It’s my habit for several years.

> start drinking a ton of water!

But not too much as you don't want water poisoning!

A ton is definitely too much.

... at any given moment.

7 litters...

...Not that much... 3ish liters spread out over the day is good. Too much water will strip your body of electrolytes and salt.

I recently upped my water intake and can report that my skin and mood feel better. I caffeinate with a strong coffee and 2 cups of tea in the morning, and around 12 I switch to pint glasses of water every 2 hours or so until 6-7 o'clock.

Yea 2.5-3l seems to be the proper amount. Only drawback is having to pee every 30 minutes.

That's an advantage - it means you're not sitting e.g. at a computer monitor and keyboard for too long. Getting up twice an hour (to pee or not) greatly reduces the potential for ergonomic harm that desk jobs - especially computer use -are known for.

Fair :D I walk everywhere anyway so I think I'm good in that regard

Bug == Feature

If you're peeing that much then evidently your body is not using all that water you're consuming. Either it's more than you need, or you're lacking in electrolytes and should increase electrolyte intake alongside the water.

By that logic, if I drank the right amount of water with 100% accuracy for multiple days, I'd only have to pee every few days.

I’m not arguing that 100% of water consumed can be retained, just that peeing every 30 minutes means you have an unnecessarily large surplus. This is simply a truth.

Your body doesn’t use up water turning it in to nothing. You are meant to pee out what isn’t lost to sweat.

Parent is correct. NHS sources say upto 7 times during the day is normal and "Every 3 to 4 hours is considered healthy. Going every 1 to 2 hours usually means you either have an overactive bladder or are drinking too much at once."

Saying every 30 minutes is normal is just the same as advocating drinking too much water

Not too sure - an overload of water can actually be dangerous i think.

Jumping in here with relevant experience - because you're absolutely right.

In 8th grade (~16 years ago) my substitute biology teacher organised a "Water drinking competition" poised to elevate our understanding of stomach capacity, etc.

Two of us went to hospital, and ~5 (including myself) had to take multiple days off of school and recover.

It's very dangerous. He lost his job.

There was a lady who died from the same thing:

https://abcnews.com/GMA/jury-rules-radio-station-jennifer-st...

What was exactly his thinking here? Do biology teachers study biology because that’s kind of the first things you learn (saline concentration, kidney, etc…)

At least where I am, substitute teachers don't have to study anything in particular at all. You simply need to have completed X number of credit hours at an accredited institution, no actual degree or certificate is required and the coursework can be literally anything. As a newly-graduated history major I signed up to substitute teach out of desperation, and was sent everywhere from kindergarten to calculus.

It’s actually dependent on your individual biology and the environment that you are in.

You need more hydration in hot climates than in cold damp ones. Also your activity influences how much hydration you need.

Ps I don’t think the article is about how much water you drink. (Edited to make the last sentence clearer)

Only if it gets ridiculous. Like after a marathon drinking a gallon on the spot (and dying from it).

Drink 2-4lt a day and you'll be fine.

Water is poisonous in that too much of it will disrupt electrolyte balance and can be fatal.

It's one of the risks with taking MDMA, there are some documented cases where people died from drinking too much water when rolling.

Everything is poisonous at high doses even oxygen.

"[E]ven oxygen" is funny because it is absurdly reactive and will explode when given the opportunity, and way back when it destroyed pretty much all life on earth except the early cyanobacteria that produced it.

Edit: And yeah, I didn't imply what you're responding to, I described the mechanism for water poisoning.

Since no one is being quantitative, here's a medical source:

https://my.clevelandclinic.org/health/diseases/water-intoxic...

> In some people, water intoxication symptoms can develop after drinking about a gallon (3 to 4 liters) of water over an hour or two.

> More than 32 ounces (about a liter) of water per hour is probably too much.

This is bullshit.

https://abcnews.com/Health/Wellness/waterlogged-america-drin...

True. The body is perfectly capable of telling you when it needs water, it's called being thirsty. If you're thirsty, drink, otherwise don't.

sort of correct. As one ages the body starts doing a poor job of signaling thirst.

https://medlineplus.gov/ency/article/003086.htm

> As people age, they are less likely to notice their thirst. Therefore, they may not drink fluids when needed.