Like a lot of other people on here I get headaches really easily if I don't drink enough water.
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I've only had about 2 cups today (it's 6 pm), plus I ran 18 kms this morning and my mouth feels like a desert.
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This doctor explains it perfectly in this youtube video.
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When someone stops drinking water, over time they get dehydrated even though you may not FEEL dehydrated, then it starts to affect their body where they start to retain water and all kinds of other things get out of whack. Most people who are dehydrated don't even know it. Some have gone so long without drinking the right amount of water that they don't even realize that feeling is dehydration, they think it's their normal every day feeling. That's why when someone goes to the doctor or emergency room the first thing they do is give them IV and liquids because most people are dehydrated and don't know it. Dri nking pop and other liquids is not the same as getting plain water. Not enough water also affects the kidney function too. Water keeps your system flushed out and purified. So if someone stops drinking water, they may not feel a difference but it does make a difference. And if you live where it's hot, you better really make sure to drink plenty of water!
Nothing bad necessarily "happens." I mean, your toes don't turn black and fall off or anything. Most people drink enough water (or get enough from food) to stay healthy without counting it, and it doesn't really have to be a certain number of ounces.
But it can delay certain good things from happening. The reason weight control programs have you drink water is more psychological than physical. It has a ton of advantages: --it's an extremely simple first goal for people who aren't used to setting and accomplishing goals
-- it gently leads you to think about whether you're meeting your body's needs for "good" stuff, not just about avoiding too much of the "bad" stuff
--some people think they're hungry when really they're just thirsty. It's odd how those signals can get mixed up. Making sure you're not thirsty can help you recognize hunger for what it is.
--some people think they're hungry when really they're just bored. Fussing with water can give you something to do instead of eating.
-- if you're even slightly dehydrated, you won't feel like exercising. Drinking 8 glasses of water means you're always pre-hydrated for exercise, even when you're so new to exercise that the word "prehydrate" would scare your socks off.
There's more, but this covers the basics. You drink the water because it's good for your mind more than because of anything it does for your body.
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