• Do you need to drink eight glasses of water per day? While it certainly can't hurt, how much water you should drink each day depends on what you eat, where you live (weather), your size, and activity. Your body can tell you when it's thirsty in order to prevent dehydration. No need to worry about exactly how many cups to drink—just use your body's cues.

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  • I know a lot of people fall for the scientific-sounding myth of "drink half your body weight in ounces of water each day." Yet, this is pseudo-science with nothing to back it up. A lot of your fluid intake each day will come from various liquids, as well as fruits and vegetables.

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  • Does coffee count towards your daily water consumption, or does it just dehydrate you? While most people believe coffee is dehydrating, research suggests that moderate intake actually can have a hydrating effect.

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  • Your kidneys (along with your liver) are great at their job, which is to detoxify. Yet, many people believe drinking more water will "flush out" or "clear toxins." There's no research to support that drinking more water will help get rid of more toxins. What you can do is stop worrying about toxins—it's typically the dieting world's marketing that makes up these myths.

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  • Have you seen alkaline water in the grocery store? The only effect it may have is hydrating you—just like regular water—and spending a few extra of your dollars. It's based on the idea that we should eat more alkaline versus acidic foods, but the evidence is weak at best.

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  • One of the most harmful myths is "you can't drink too much water." This is common among athletes, especially endurance athletes who have it pounded into their heads to drink tons of water. While it's essential to stay hydrated during athletics, too much water can lead to hyponatremia, a potentially lethal effect that throws off your electrolytes.

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  • Is coconut water better than water? Nope. If you want extra electrolytes after a sweaty yoga class, for example, give it a try. Otherwise, regular water is totally fine. On the other hand, I highly recommend a fresh coconut on a hot day on the beach.

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