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5 Things to Know About H20

Find out why water is the best hydrator—and how much your body really needs.
5 Things to Know About H20

If you're still holding onto the notion that eight cups of water a day is sufficient (I bet you also still believe that you need to wait 30 minutes after eating to go for a swim), you're not working at your body's peak performance level.

"Water makes up about 60-70 percent of our body and plays a role in virtually every function, from keeping our blood flowing and skin healthy right down to our ability to blink our eyes," says Wendy Bazilian, Dr.P.H., R.D., "Water is our most important nutrient."

Sure, hydration is important to survival, but if you are healthy and have access to clean water, death by dehydration probably isn't a major fear. So why should you be concerned with hydration? Even mild dehydration can begin to compromise your health and stifle the effectiveness of your workout. And conversely, overhydration during outdoors workouts can drastically lower sodium levels in your blood, and even lead to death. Here are the top five things you need to know about water, and how much your body really needs.

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A few years ago Michael Boschmann, M.D., and colleagues from Berlin's Franz-Volhard Clinical Research Center found that after drinking about 17 ounces of water, the metabolic rates of the study's participants increased by 30%. And the researchers estimated that if a person increases his water consumption by 1.5 liters (51 ounces) a day, he would burn an extra 17,400 calories per year. That's about five pounds just from drinking more water. Additionally, a study by Dr. Brenda Davy, an associate professor at Virginia Tech, found that people who drank water before a meal consumed an average of 75 fewer calories at that meal. 

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"Poor hydration leads to increased tiredness, reduced alertness, and impaired short-term memory. Good luck with using that as an excuse to your boss. "Even mild dehydration—being only 1-2% dehydrated has shown to impair cognitive performance, like the ability to perform mental tests and skills requiring thinking," says Bazilian. 

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Not seeing gains in the gym? Perhaps a lack of water is to blame. "If you don't hydrate yourself correctly you won't perform very well and you won't see results," says American Council on Exercise spokesperson and exercise physiologist Fabio Comana, M.S. Muscles are about 80% water and dehydration diminishes blood flow to the brain, the delivery of nutrients to your muscles, and slows down your recovery process. Water also helps reduce the chance of injury and pain because of the key role it plays in keeping joints lubricated. 

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While water may not be the fountain of youth, it will help improve dry skin, cracked lips, and wrinkles. Water is required to make saliva which is the body's best natural defense against tooth decay, and good hydration helps preserve skin's elasticity and tone. 

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The Beverage Institute for Health & Wellness has created a hydration calculator to help you determine your daily water needs based upon your age, weight, health, environment, and activity level, and you can use the Institute of Medicine's recommendation of 3.7 liters (125 ounces) daily for men as a guideline. But if you're physically active, living in a hot climate or taking workout supplements such as creatine, take precautions to consume extra water. 

The Consensus Panel has released new recommendations (published in the Clinical Journal of Sport Medicine) to recognize the hazards of drinking beyond thirst during exercise by advising men and women to drink when thirsty. You may think you’re doing your body good by downing water and sports drinks during your outdoor workout, but overhydrating can severely reduce blood sodium levels in the body, interfering with normal regulatory processes. This is especially important for endurance runners training for marathons, recreational exercisers, and athletes getting ready for training camps to recognize this summer—as EAH was the cause of two high school football players’ deaths last year. 

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