Why you don't need 8 glasses of water a day | Body Stuff with Dr. Jen Gunter | TED

897,272 views ใƒป 2021-06-09

TED


ืื ื ืœื—ืฅ ืคืขืžื™ื™ื ืขืœ ื”ื›ืชื•ื‘ื™ื•ืช ื‘ืื ื’ืœื™ืช ืœืžื˜ื” ื›ื“ื™ ืœื”ืคืขื™ืœ ืืช ื”ืกืจื˜ื•ืŸ.

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Transcriber:
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You know that whole thing about drinking eight glasses of water a day?
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ืชืจื’ื•ื: ืžืขื™ื™ืŸ ืฉื˜ื™ื™ื ืžืฅ ืขืจื™ื›ื”: Ido Dekkers
ืืชื ืžื›ื™ืจื ืืช ื›ืœ ื”ืขื ื™ื™ืŸ ืฉืœ ืœืฉืชื•ืช ืฉืžื•ื ื” ื›ื•ืกื•ืช ืžื™ื ื‘ื™ื•ื?
00:03
Sorry to have to tell you this, but it's a myth.
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ืžืฆื˜ืขืจืช ืœืกืคืจ ืœื›ื, ืื‘ืœ ื–ื” ืžื™ืชื•ืก.
00:06
It won't make your skin brighter,
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ื–ื” ืœื ื™ื™ืชืŸ ืœื›ื ืขื•ืจ ื ืงื™,
00:08
it won't make you feel clearheaded,
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ื–ื” ืœื ื™ื’ืจื•ื ืœื›ื ืœื—ืฉื•ื‘ ืฆืœื•ืœ.
00:10
it won't make you feel more energetic.
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ื–ื” ืœื ื™ื’ืจื•ื ืœื›ื ืœื”ืจื’ื™ืฉ ื™ื•ืชืจ ืื ืจื’ื˜ื™ื™ื.
00:12
It might, however, make you have to pee a lot.
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ื–ื” ืื•ืœื™ ืœืžืขืฉื”, ื™ื’ืจื•ื ืœื›ื ืœืขืฉื•ืช ื”ืจื‘ื” ืคื™ืคื™.
00:16
(Music)
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(ืžื•ื–ื™ืงื”)
00:17
[Body Stuff with Dr. Jen Gunter]
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[ืขื ื™ื™ื ื™ื ืฉืœ ื”ื’ื•ืฃ ืขื ื“โ€œืจ ื’โ€™ืŸ ื’ืื ื˜ืจ]
00:18
(Music)
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(ืžื•ื–ื™ืงื”)
00:20
Many people don't understand the biology behind their bodies.
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ื”ืžื•ืŸ ืื ืฉื™ื ืœื ืžื‘ื™ื ื™ื ืืช ื”ื‘ื™ื•ืœื•ื’ื™ื” ืžืื—ื•ืจื™ ื”ื’ื•ืฃ ืฉืœื”ื.
00:23
There's a lot of misinformation out there.
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ืงื™ื™ื ื”ืจื‘ื” ืžื™ื“ืข ืฉื’ื•ื™.
00:25
But the truth is that when you understand how your systems function,
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ืื‘ืœ ื”ืืžืช ื”ื™ื ืฉื›ืฉืืชื ืžื‘ื™ื ื™ื ืื™ืš ื”ืžืขืจื›ืช ืฉืœื›ื ืคื•ืขืœืช,
00:29
you're able to make better decisions.
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ืืชื ื™ื›ื•ืœื™ื ืœื”ื—ืœื™ื˜ ื”ื—ืœื˜ื•ืช ื˜ื•ื‘ื•ืช ื™ื•ืชืจ.
00:31
You're not as prone to fall for hype or pseudoscience.
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ืืชื ืœื ื›ืœ ื›ืš ื ื•ื˜ื™ื ืœื™ืคื•ืœ ืขืœ ื”ื™ื™ืค ืื• ืžื“ืข ืคืกืื•ื“ื•.
00:35
You'll feel empowered to understand what's really going on.
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ื™ื”ื™ ืœื›ื ื›ื— ืœื”ื‘ื™ืŸ ืžื” ื‘ืืžืช ืงื•ืจื”.
00:39
One myth that really bugs me
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ืžื™ืชื•ืก ืื—ื“ ืฉื‘ืืžืช ืžืฆื™ืง ืœื™
00:41
is the idea that you need eight glasses of water a day.
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ื–ื” ื”ืจืขื™ื•ืŸ ืฉืฆืจื™ืš ืœืฉืชื•ืช ืฉืžื•ื ื” ื›ื•ืกื•ืช ืžื™ื ื‘ื™ื•ื.
00:45
Honestly, it's pretty shocking how ingrained it is.
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ื”ืืžืช, ื–ื” ื“ื™ ืžืคืชื™ืข ื›ืžื” ื–ื” ืžื•ืฉืจืฉ.
00:48
You hear it on TV, you see it in articles.
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ืืชื ืฉื•ืžืขื™ื ืืช ื–ื” ื‘ื˜ืœื•ื•ื™ื–ื™ื”, ืืชื ืจื•ืื™ื ืืช ื–ื” ื‘ื›ืชื‘ื•ืช.
00:51
But like I said, it's nonsense.
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ืื‘ืœ ื›ืžื• ืฉืืžืจืชื™, ื–ื” ืฉื˜ื•ื™ื•ืช.
00:54
For the most part,
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ืจื•ื‘ ื”ื–ืžืŸ, ื”ื’ื•ืฃ ืฉืœื›ื ื™ื’ื™ื“ ืœื›ื ืžืชื™ ืืชื ืฆืจื™ื›ื™ื ืœืฉืชื•ืช ืžื™ื,
00:55
your body will tell you when you need to drink water,
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00:58
because you've got these wonderful, amazing, undervalued things --
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ื›ื™ ื™ืฉ ืœื›ื ืืช ื”ื“ื‘ืจื™ื ื”ืžื“ื”ื™ืžื™ื, ื•ื”ืœื ืžื•ืขืจื›ื™ื ื”ืืœื” -
01:03
kidneys.
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ื›ืœื™ื•ืช.
01:04
Kidneys are the bean-shaped organs located to either side of your spine,
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ื›ืœื™ื•ืช ื”ื ืื™ื‘ืจื™ื ื‘ืฆื•ืจืช ืฉืขื•ืขื™ืช ื”ืžืžื•ืงืžื™ื ื‘ืฉื ื™ ื”ืฆื“ื“ื™ื ืฉืœ ืขืžื•ื“ ื”ืฉื“ืจื”,
01:08
right below your ribs.
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ืžืžืฉ ืžืชื—ืช ืœืฆืœืขื•ืช.
01:09
They're often thought of as a filter or a waste-removal system,
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ืจื•ื‘ ื”ื–ืžืŸ ื—ื•ืฉื‘ื™ื ืฉื”ืŸ ืคื™ืœื˜ืจ, ืื• ืžืขืจื›ืช ืกื™ื ื•ืŸ ืคืกื•ืœืช,
01:13
but that doesn't do the kidneys justice.
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ืื‘ืœ ื–ื” ืœื ื›ืœ ืžื” ืฉื”ื.
01:16
Your body is an environment where everything, fluid and chemicals,
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ื”ื’ื•ืฃ ื”ื•ื ืกื‘ื™ื‘ื” ื‘ื” ื”ื›ืœ, ื ื•ื–ืœ ื•ื›ื™ืžื™ืงืœื™ื,
01:20
needs to be in a delicate balance.
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ืฆืจื™ื›ื™ื ืœื”ื™ื•ืช ื‘ืื™ื–ื•ืŸ ืขื“ื™ืŸ.
01:22
The kidneys do a lot of the heavy lifting when it comes to this balance.
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ื”ื›ืœื™ื•ืช ืขื•ื‘ื“ื•ืช ืงืฉื” ืžืื•ื“ ื‘ืฉื‘ื™ืœ ื”ืื™ื–ื•ืŸ ื”ื–ื”.
01:27
Every day, blood in your body passes through the kidneys.
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ื›ืœ ื™ื•ื, ื“ื ื‘ื’ื•ืฃ ืขื•ื‘ืจ ื“ืจืš ื”ื›ืœื™ื•ืช.
01:31
What you eat, drink, the temperature around you,
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ืžื” ืฉืืชื ืื•ื›ืœื™ื, ืฉื•ืชื™ื, ื”ื˜ืžืคืจื˜ื•ืจื” ืกื‘ื™ื‘ื›ื,
01:34
how much you exercise --
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ื›ืžื” ืืชื ืžืชืืžื ื™ื
01:36
all of this affects what's going on with your body.
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ื›ืœ ื–ื” ืžืฉืคื™ืข ืขืœ ืžื” ืงื•ืจื” ืขื ื”ื’ื•ืฃ ืฉืœื›ื.
01:38
Your kidneys, along with your nervous system and various hormones,
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ื”ื›ืœื™ื•ืช, ื‘ื™ื—ื“ ืขื ืžืขืจื›ืช ื”ืขืฆื‘ื™ื ื•ื”ื•ืจืžื•ื ื™ื ืฉื•ื ื™ื,
01:42
are constantly watching many gauges
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ื›ืœ ื”ื–ืžืŸ ืžืกืชื›ืœื™ื ืขืœ ื”ืžื•ืŸ ืžื“ื“ื™ื,
01:44
and making adjustments about fluid, salt and levels of other substances
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ื•ื™ื•ืฆืจื™ื ืฉื™ื ื•ื™ื™ื ื‘ื ื•ื–ืœื™ื, ืžืœื— ื•ื›ืžื•ื™ื•ืช ืฉืœ ื“ื‘ืจื™ื ืื—ืจื™ื.
01:49
in real time.
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ื‘ื–ืžืŸ ืืžืช.
01:50
They do this with about one million tiny structures called nephrons.
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ื”ื ืขื•ืฉื•ืช ืืช ื–ื” ืขื ืžื™ืœื™ื•ืŸ ืžื‘ื ื™ื ืงื˜ื ื™ื ื‘ืฉื ื ืคืจื•ื ื™ื.
01:55
These nephrons are kind of like workers on a conveyor belt,
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ื”ื ืคืจื•ื ื™ื ื”ืืœื” ืงืฆืช ื›ืžื• ืขื•ื‘ื“ื™ื ืขืœ ืžืกื•ืข.
01:58
actively adding things and taking things away,
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ื›ืœ ื”ื–ืžืŸ ืžื•ืกื™ืคื™ื ื•ืœื•ืงื—ื™ื ื“ื‘ืจื™ื,
02:01
things like sodium, glucose or sugar, calcium, amino acids and water,
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ื“ื‘ืจื™ื ื›ืžื• ื ืชืจืŸ, ื’ืœื•ืงื•ื– ืื• ืกื•ื›ืจ, ืกื™ื“ืŸ, ื—ื•ืžืฆื•ืช ืืžื™ื ื• ื•ืžื™ื,
02:07
to make sure the body maintains homeostasis, or balance.
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ื›ื“ื™ ืœื•ื•ื“ื ืฉื”ื’ื•ืฃ ืฉื•ืžืจ ืขืœ ื”ื•ืžืื•ืกื˜ื–ื™ืก, ืื• ืื™ื–ื•ืŸ.
02:11
If levels of anything get too high or too low,
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ืื ื›ืžื•ืช ืฉืœ ืžืฉื”ื• ื ื”ื™ื™ืช ื’ื‘ื•ื”ื” ืžื™ื“ื™, ืื• ื ืžื•ื›ื” ืžื™ื“ื™,
02:14
then that can be harmful.
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ื–ื” ื™ื›ื•ืœ ืœื’ืจื•ื ื ื–ืง.
02:15
And it is the job of the kidneys
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ื•ื–ืืช ื”ืขื‘ื•ื“ื” ืฉืœ ื”ื›ืœื™ื•ืช
02:17
to keep the levels of many of these substances in the just-right zone.
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ืœืฉืžื•ืจ ืฉื”ืจืžื•ืช ืฉืœ ื”ื—ื•ืžืจื™ื ื”ืืœื” ื‘ื“ื™ื•ืง ื‘ื›ืžื•ืช ื”ื ื›ื•ื ื”.
02:21
Substances that aren't needed leave the kidney
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ื—ื•ืžืจื™ื ืฉืœื ืฆืจื™ืš ืขื•ื–ื‘ื™ื ืืช ื”ื›ืœื™ื•ืช
02:24
and head to the bladder,
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ื•ืžืชืงื“ืžื™ื ืœืฉืœืคื•ื—ื™ืช ื”ืฉืชืŸ,
02:26
where you excrete them in the form of urine.
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ืฉื ืžื•ืฆื™ืื™ื ืื•ืชื ื‘ืฆื•ืจืช ืฉืชืŸ.
02:28
So where do eight glasses of water a day fit in?
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ืื– ืื™ืคื” ืฉืžื•ื ื” ื›ื•ืกื•ืช ืžื™ื ื ื›ื ืกื•ืช?
02:31
They don't.
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ื”ืŸ ืœื.
02:32
Noticed that I did not say
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ืฉื™ืžื• ืœื‘ ืฉืœื ืืžืจืชื™
02:34
that the kidney function is improved with excess water.
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ืฉืคืขื•ืœืช ื”ื›ืœื™ื•ืช ืžืฉืชืคืจืช ืขื ื™ื•ืชืจ ืžื™ื.
02:37
Imagine that you're sweating a lot,
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ืชื“ืžื™ื™ื ื• ืฉืืชื ืžื–ื™ืขื™ื ื”ืจื‘ื”,
02:39
so you're losing water from your blood.
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ืื– ืืชื ืžืื‘ื“ื™ื ืžื™ื ืžื”ื“ื.
02:41
The kidneys know your blood volume is dropping ever so slightly
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ื”ื›ืœื™ื•ืช ื™ื•ื“ืขื•ืช ืฉื”ื ืคื— ืฉืœ ื”ื“ื ื™ื•ืจื“ ืžืขื˜
02:45
and that your blood is getting ever so slightly saltier.
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ื•ืฉื”ื“ื ืฉืœื›ื ื ื”ื™ื” ืžืขื˜ ืžืœื•ื— ื™ื•ืชืจ.
02:48
They compensate by absorbing more water back into the blood,
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ื”ืŸ ืžืคืฆื•ืช ืขืœ ื›ืš ื‘ืกืคื™ื’ืช ืขื•ื“ ืžื™ื ื‘ื—ื–ืจื” ืœื“ื
02:52
making the urine more concentrated.
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ืžื” ืฉื”ื•ืคืš ืืช ื”ืฉืชืŸ ืœื™ื•ืชืจ ืžืจื•ื›ื–.
02:54
If the kidneys sense enough fluid can't be reabsorbed from the urine,
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ืื ื”ื›ืœื™ื•ืช ืžืจื’ื™ืฉื•ืช ืฉืื™ืŸ ืžืกืคื™ืง ื ื•ื–ืœ ืœื”ืกืคื™ื’ ืœื“ื,
02:58
you're signaled to drink, meaning you get thirsty.
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ืืชื ืžื•ื–ื›ืจื™ื ืœืฉืชื•ืช, ืžื” ืฉืื•ืžืจ ืฉืืชื ื ื”ื™ื™ื ืฆืžืื™ื.
03:01
If you don't have fluid available,
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ืื ืื™ืŸ ืžืกืคื™ืง ื ื•ื–ืœ ื–ืžื™ืŸ,
03:03
the thirst message gets stronger and stronger.
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ื”ืกื™ืžืŸ ืœืฉืชื•ืช ื ื”ื™ื” ื—ื–ืง ื™ื•ืชืจ ื•ื™ื•ืชืจ.
03:07
A person facing real dehydration won't be unsure if they need water.
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ื‘ืŸ ืื“ื ืžืื•ื“ ืžื™ื•ื‘ืฉ ืœื ื™ื”ืกืก ืื ื”ื•ื ืฆืจื™ืš ืžื™ื.
03:12
They'll do whatever they need to get it.
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ื”ื ื™ืขืฉื• ืžื” ืฉืฆืจื™ืš ื‘ืฉื‘ื™ืœ ืœื”ืฉื™ื’ ืืช ื–ื”.
03:15
It's one of our most basic instincts
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ื–ื” ืื—ื“ ื”ืื™ื ืกื˜ื™ื ืงื˜ื™ื ื”ื›ื™ ื‘ืกื™ืกื™ื™ื ืฉืœื ื•.
03:17
that's evolved over a very long time,
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ืฉื”ืชืคืชื— ืœืื•ืจืš ื–ืžืŸ ืืจื•ืš ืžืื•ื“,
03:21
in environments where clean water
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ื‘ืกื‘ื™ื‘ื” ื‘ื” ืžื™ื ื ืงื™ื™ื
03:22
wasn't nearly as readily available as it is today.
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ืœื ื”ื™ื• ื–ืžื™ื ื™ื ื›ืžื• ืฉื”ื ื”ื™ื•ื.
03:25
So thanks to your kidneys,
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ืื– ืชื•ื“ื•ืช ืœื›ืœื™ื•ืช ืฉืœื›ื,
03:27
your body is really good at maintaining hydration.
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ื”ื’ื•ืฃ ืฉืœื›ื ืžืื•ื“ ื˜ื•ื‘ ื‘ืฉืžื™ืจื” ืขืœ ืœื—ื•ืช.
03:30
But if you stop counting eight glasses of water a day,
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ืื‘ืœ ืื ืชืคืกื™ืงื• ืœืกืคื•ืจ ืฉืžื•ื ื” ื›ื•ืกื•ืช ืžื™ื ื‘ื™ื•ื,
03:33
how much should you be drinking?
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ื›ืžื” ื›ื“ืื™ ืฉืชืฉืชื•?
03:35
The answer is simple:
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ื”ืชืฉื•ื‘ื” ืคืฉื•ื˜ื”:
03:37
there is no should.
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ืื™ืŸ โ€œื›ื“ืื™โ€œ.
03:39
When you feel thirsty, drink some water.
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ื›ืฉืืชื ืžืจื’ื™ืฉื™ื ืฆืžืื™ื, ืฉืชื• ืงืฆืช ืžื™ื.
03:41
You can trust your body.
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ืืชื ื™ื›ื•ืœ ืœืกืžื•ืš ืขืœ ื”ื’ื•ืฃ ืฉืœื›ื.
03:44
Unless you have kidney stones or are elderly --
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ืืœื ืื ื›ืŸ ื™ืฉ ืœื›ื ืื‘ื ื™ื ื‘ื›ืœื™ื•ืช ืื• ืฉืืชื” ืžื‘ื•ื’ืจื™ื-
03:46
sometimes, our messaging systems get a little worn with age --
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ืœืคืขืžื™ื ืžืขืจื›ืช ื”ืชืงืฉื•ืจืช ืžืชืงืœืงืœืช ืงืฆืช ืขื ื”ื’ื™ืœ -
03:50
or your doctor has told you otherwise,
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ืื• ืฉื”ืจื•ืคื ืฉืœื›ื ืืžืจ ืœื›ื ืื—ืจืช,
03:52
constantly monitoring how much water you drink
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ื›ืœ ื”ื–ืžืŸ ืœื‘ื“ื•ืง ื›ืžื” ืžื™ื ืฉืชื™ืชื,
03:55
is not really necessary.
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ื–ื” ืœื ื‘ืืžืช ื”ื›ืจื—ื™.
03:57
Here's a point that's often missed:
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ื”ื ื” ื ืงื•ื“ื” ืฉื”ืจื‘ื” ืžืคืกืคืกื™ื:
03:59
every single thing you consume contains water.
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ื›ืœ ื“ื‘ืจ ืฉืืชื ืฆื•ืจื›ื™ื ืžื›ื™ืœ ืžื™ื.
04:02
Your morning coffee has water, so does your breakfast.
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ื”ืงืคื” ื‘ื‘ื•ืงืจ ืžื›ื™ืœ ืžื™ื, ื›ืš ื’ื ืืจื•ื—ืช ื”ื‘ื•ืงืจ.
04:05
And that snack -- an apple, an orange, a glass of juice, a granola bar --
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ื•ื”ื—ื˜ื™ืฃ, ืชืคื•ื—, ืชืคื•ื–, ื›ื•ืก ืžื™ืฅ ืื• ื‘ืจ ื’ืจื ื•ืœื” -
04:10
just like you, they're made of water too.
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ื‘ื“ื™ื•ืง ื›ืžื•ื›ื, ื”ื ืขืฉื•ื™ื™ื ื’ื ืžืžื™ื.
04:13
So as long as you're listening to your body's internal sense of thirst,
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ืื– ื›ืœ ืขื•ื“ ืืชื ืžืงืฉื™ื‘ื™ื ืœืฆื•ืจืš ืฉืœ ื”ื’ื•ืฃ ืฉืœื›ื ืœืฉืชื•ืช,
04:17
there's really no need to be counting those eight glasses.
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ืื™ืŸ ื‘ืืžืช ืฆื•ืจืš ืœืกืคื•ืจ ืฉืžื•ื ื” ื›ื•ืกื•ืช ืžื™ื ื‘ื™ื•ื.
ืขืœ ืืชืจ ื–ื”

ืืชืจ ื–ื” ื™ืฆื™ื’ ื‘ืคื ื™ื›ื ืกืจื˜ื•ื ื™ YouTube ื”ืžื•ืขื™ืœื™ื ืœืœื™ืžื•ื“ ืื ื’ืœื™ืช. ืชื•ื›ืœื• ืœืจืื•ืช ืฉื™ืขื•ืจื™ ืื ื’ืœื™ืช ื”ืžื•ืขื‘ืจื™ื ืขืœ ื™ื“ื™ ืžื•ืจื™ื ืžื”ืฉื•ืจื” ื”ืจืืฉื•ื ื” ืžืจื—ื‘ื™ ื”ืขื•ืœื. ืœื—ืฅ ืคืขืžื™ื™ื ืขืœ ื”ื›ืชื•ื‘ื™ื•ืช ื‘ืื ื’ืœื™ืช ื”ืžื•ืฆื’ื•ืช ื‘ื›ืœ ื“ืฃ ื•ื™ื“ืื• ื›ื“ื™ ืœื”ืคืขื™ืœ ืืช ื”ืกืจื˜ื•ืŸ ืžืฉื. ื”ื›ืชื•ื‘ื™ื•ืช ื’ื•ืœืœื•ืช ื‘ืกื ื›ืจื•ืŸ ืขื ื”ืคืขืœืช ื”ื•ื•ื™ื“ืื•. ืื ื™ืฉ ืœืš ื”ืขืจื•ืช ืื• ื‘ืงืฉื•ืช, ืื ื ืฆื•ืจ ืื™ืชื ื• ืงืฉืจ ื‘ืืžืฆืขื•ืช ื˜ื•ืคืก ื™ืฆื™ืจืช ืงืฉืจ ื–ื”.

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