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Your body uses water in many ways. Water cushions and lubricates joints; nourishes and protects the brain, spinal cord and other tissues; keeps the body's temperature normal; and helps remove waste through perspiration, bowel movements and urination.

Water is essential for proper circulation in the body. The levels of oxygen in the bloodstream are greater when the body is well hydrated. The more oxygen the body has readily available the more fat it will burn for energy without the presence of oxygen the body cannot utilize stored fat for energy efficiently. Not only will the body burn more fat when well hydrated but because there are increased oxygen levels you will also have more energy.

You may have been told that in order to be healthy, you must drink eight glasses of water each day, and each glass must contain 8 ounces of water. You may also have been told that only water will fulfill this requirement, not other liquids that contain either caffeine or alcohol. Both ideas appear to be myths, according to Dr. Heinz Valtin of the Dartmouth College Medical School

Why do humans need water?

Two-thirds of the human body (by weight) consists of water. Humans need water for circulation, respiration, and converting food to energy. After oxygen, water is the body's most important nutrient. Quite simply, we need water to live

To stay healthy, you need to continually replenish your fluid supply. Experts recommend drinking approximately two quarts (64 ounces or about eight glasses) of water each day. Of course, if you live in an extremely hot or cold area — or if you exercise a lot — you may need to drink a gallon or more of water every day.

So how long can you survive without water? Humans in average shape and perfect conditions (not too hot or cold) can probably live for three to five days without any water if they're not physically exerting themselves. Healthier people can live a day or so

longer, while those who are unhealthy or exposed to particularly hot or cold weather may not survive as long.

Water makes up nearly 85 percent of your brain, about 80 percent of your blood and about 70 percent of your lean muscle. (Because there are a lot of tissues that have less water, the average is about 50 percent.).

When you drink too much water, you can develop a condition known as hyponatremia, in which the excess water floods your body's cells, causing them to swell up. Your swollen brain cells then cause a wide range of symptoms, including a bad headache, nausea, cramps, mental confusion, convulsions, fatigue, coma and death.

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