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Why exactly does water help you lose weight?

Why exactly does water help you lose weight? I just don't get it.

Tue. Jul 25, 2:04pm

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I am sure there is someone more knowledge on this one then me but...I think it helps process food.... It helps break down fats and move them along.... and for me it helps me eat less because I feel "fuller" with the more water I drink...

Tuesday, July 25, 2006, 2:09 PM

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I don't think it's for any "fancy" reason. i think people who drink more water tend to stay full longer and are less likeley to eat. Also, if you are normally a soda or juice drinker, and you replace them w/ water-that is a whole bunch of calories that you are no longer consuming any more!

Tuesday, July 25, 2006, 2:20 PM

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You need water to survive. There are a lot of chemical processes that go on in your body that require it. If you don't drink enough, your body doesn't function at an optimal level, which makes weight loss difficult (and can give you headaches, constipation, and lots of other lovely things). It doesn't have to be plain water, though, you can get it from other liquids and foods, just watch the calorie intake. And be sure to increase your liquid intake if you exercise, to make up for what you lose through breathing and sweating.

It can also help curb your appetite.

Tuesday, July 25, 2006, 2:25 PM

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plus, the more water you "feed" your body, the less it will retain, thus dropping some unwanted pounds.

Tuesday, July 25, 2006, 2:35 PM

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The more you weigh, the more you have to drink too. A good rule of thumb is 1/2 your weight is how many ounces you truely need to be hydrated. Currenlty, I need to drink 100 oz - that's a lot more than the reccomended 64 oz of 8 8oz glasses per day. But I feel better at the 100 oz than I do at the 64 - 64 and I'm still thirsty.

Tuesday, July 25, 2006, 2:57 PM

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Water will keep you full for longer and stave off hunger pains. Additionally, most people confuse thirst with hunger, and so when they're actually thirsty, they think they're hungry and they eat. If they drank water first, they might realize that they weren't hungry.

Additionally, water helps to flush out your system. Most no-calorie drinks are full of salt, which retains fluids in your body (which makes you weigh more), and drinks with calories are just extra calories that you don't need.

Tuesday, July 25, 2006, 4:10 PM

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The way I understand it is that water helps speed up your metabolism. It assists your body in keeping your cells hydrated. If you become dehydrated your body is more likely to store fat. It also helps in your workout. Ever feel tired when you are not drinking enough water? Your blood becomes more sludge-like the less water you have in you, thus making it harder to exercise.
You should have at LEAST 64 ounces a day. More if you can. Ever feel dizzy when it gets hot? That may be symptoms of dehydration. Drink, drink, drink! By the time you feel thirsty, you are already dehydrated.
When you first start drinking lots of water, you may swell up a bit as your body stores it in anticipation for you getting dehydrated again, but once it determines that the water will keep coming in, it drops back to normal levels and uses it like it should.
You may also notice that in the hot weather you do not feel as hot as when you weren't drinking enough water. Think of the radiator in your car---it needs the liquid to cool the engine. Your body is the same.

Water is the key to weight loss and proper body function.
Drink, guzzle, slurp, your way to health!

Tuesday, July 25, 2006, 8:23 PM

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Your body can't even break down fat without water. So if you're dehydrated, you are slowing your body's ability to lose weight substantially! Also, fat is used as a dumping ground to store toxins from the junk eaten, drugs and medications taken and other negative environmental factors. If you aren't very well hydrated and start breaking down fat, it increases the toxicity in your system, much like stepping into a mud puddle and stirring up the silt. Without additional water to help filter the garbage out of your body, you can definitely feel less energized and sluggish.

Tuesday, July 25, 2006, 11:30 PM

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Wednesday, October 11, 2006, 7:18 PM

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The question of this thread, "Why exactly does water help you lose weight?" has bugged me ever since the thread was posted this past summer. I recently found some answers on pages 80 and 81 of the book Fit and Fabulous in 15 Minutes by Teresa Tapp. She references 2 studies showing that drinking water does, in fact, boost metabolism.
The end of my post has a link to one of the studies:

I can't find the other study on the web, but it's entitled, "Dehydration: Does it influence resting rate?" It was published in Medical Science Sports Exercise in 1996. The authors were Woodland, Benson, Luetkemeier, Bullough, Barton, and Askew.


Thursday, November 30, 2006, 5:29 PM

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I've read that water is needed for your body to repair your muscles after you workout.

I've also read that the more muscular you are, the more water your body stores, which is one of the reasons that very fit, muscular people can weigh significantly more than you'd think they would just by looking at them.

Thursday, November 30, 2006, 8:35 PM

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Please copy/paste the following text to properly cite this How Stuff Works article:

"Does drinking ice water burn calories?." 17 August 2000. 25 April 2008. Does drinking ice water burn calories?

Inside This Article
1. Does drinking ice water burn calories? 2. Lots More Information 3. See all Fitness articles
For anyone trying to lose weight, this question is an exciting one! If you simply want to know if your body burns calories warming up the water, the answer is yes. But if you want to know if drinking a lot of ice water can help you lose weight, or keep weight off, this "yes" needs to be qualified with some calculations.

Digital Vision/Getty Images
While you definitely shouldn't depend on ice water consumption to replace exercise or a healthy diet, drinking cold water instead of warm water does burn extra Calories.

First of all, calories are case-sensitive. There are calories and then there are Calories. Calories with a big "c" are the ones used to describe the amount of energy contained in foods. A calorie with a little "c" is defined as the amount of energy it takes to raise the temperature of 1 gram of water 1 degree Celsius.

What most people think of as a Calorie is actually a kilo-calorie: It takes one Calorie to raise the temperature of 1 kilogram of water 1 degree Celsius. So when you drink a 140-Calorie can of cola, you are ingesting 140,000 calories. There is no cause for alarm, because the conversion applies across the board. When you burn 100 Calories jogging a mile, you are burning 100,000 calories.

So, considering that the definition of a calorie is based on raising the temperature of water, it is safe to say that your body burns calories when it has to raise the temperature of ice water to your body temperature. And unless your urine is coming out ice cold, your body must be raising the temperature of the water. So calories are being burned.

Let's figure out exactly what you're burning when you drink a 16-ounce (0.5 liter) glass of ice water:

The temperature of ice water can be estimated at zero degrees Celsius.
Body temperature can be estimated at 37 degrees Celsius.
It takes 1 calorie to raise 1 gram of water 1 degree Celsius.
There are 473.18 grams in 16 fluid ounces of water.
So in the case of a 16-ounce glass of ice water, your body must raise the temperature of 473.18 grams of water from zero to 37 degrees C. In doing so, your body burns 17,508 calories. But that's calories with a little "c." Your body only burns 17.5 Calories, and in the grand scheme of a 2,000-Calorie diet, that 17.5 isn't very significant.
But let's say you adhere to the "eight 8-ounce glasses of water a day" nutritional recommendation. In 64 ounces of water, there are 1,892.72 grams. So to warm up all that water in the course of a day, your body burns 70,030 calories, or 70 Calories. And over time, that 70 Calories a day adds up. So, while you definitely shouldn't depend on ice water consumption to replace exercise or a healthy diet, drinking cold water instead of warm water does, in fact, burn some extra Calories!


Friday, April 25, 2008, 5:18 PM

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