Water Facts, Hydration Factor

Your body is one-half to four-fifths water, depending on how much body fat you have. Water makes up nearly 85 percent of your brain, about 80 percent of your blood and about 70 percent of your lean muscle. Every system in your body depends on water. Its roles are impressive.

Water : regulates your body temperature, removes wastes, carries nutrients and oxygen to your cells, cushions your joints, helps prevent constipation, lessens the burden on your kidneys and liver by removing some of the toxins, helps dissolve vitamins. Lack of water can lead to dehydration. Even slight dehydration can sap your energy and make you feel lethargic. Dehydration poses a particular health risk for the very young and very old.
You lose about 10 cups of fluid a day through sweating, exhaling, urinating and bowel movements. Drinking water isn't the only way to replace those fluids. You also get water from other beverages and even from foods. In an average diet, it's estimated that solid foods provide between three and four cups of water a day. But because it's difficult to estimate the amount of water solid foods contribute, it's recommended that you only count fluids toward meeting your goal of eight glasses a day. But that's only a ballpark estimate. To better determine how much water you specifically need each day, divide your weight in half. Your answer is the approximate number of fluid ounces you should drink daily. Eight glasses is the average. Some people need more, while others can get by on less. Exercising or engaging in any activity that causes you to perspire and dehydrate increases your water requirement, as do hot humid or cold weather and high altitudes.Some beverages, such as those with caffeine and alcohol, are dehydrating, so if you drink them, you need even more water to compensate.
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