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Energy drinks are supposed to do just what the name implies -- give you an extra burst of energy. As it turns out, most of that "energy" comes from two main ingredients: sugar and caffeine. A typical energy drink can contain up to 80 milligrams of caffeine (about the same amount as a cup of coffee). By comparison, a 2006 study found that the average 12-ounce soda contains 18 to 48 mg of caffeine.

Other than caffeine levels, how do energy drinks differ from sodas and sports drinks? Soft drinks are mainly water, sugar and flavoring. They don't do anything for your body; they're just supposed to taste good. Sports drinks are designed to replenish fluids lost during activity. They typically contain water, electrolytes and sugar. Energy drinks have added caffeine and other ingredients that their manufacturers say increase stamina and "boost" performance. They're designed for students, athletes and anyone else who wants an extra energy kick.

Energy drinks became popular in Asia long before they reached the United States. In 1962, Japanese pharmaceutical company, Taisho, released its Lipovitan D drink. It was designed to help employees work hard well into the night. Lipovitan D contains taurine, the same ingredient found in many of today's energy drinks.

Looking at the ingredients, energy drinks appear to be part soft drink and part nutritional supplement. According to reviewers, the taste falls within the same range. People who have tried energy drinks have described the taste as ranging from "medicinal" to "molten Sweet Tart."

Energy drinks are generally safe, but like most things, you should drink them in moderation. Because caffeine is a stimulant -- consuming a lot of it can lead to heart palpitations, anxiety and insomnia -- it also can make you feel jittery and irritable. Over time, caffeine can become addictive. It is also a diuretic -- it causes the kidneys to remove extra fluid into the urine. That leaves less fluid in the body. so drinking an energy drink while you're exercising can be particularly dangerous. The combination of the diuretic effect and sweating can severely dehydrate you.

Many people mix energy drinks with vodka or other alcohol to make a high-energy cocktail. Since alcohol is a depressant, it has a tranquilizing effect on the body that can make you unaware of how much you're drinking. One study found that men who combined energy drinks with alcohol felt alert and sober, even though they were actually drunk. And since both alcohol and energy drinks dehydrate you, when combined they can cause your body's fluids to drop to dangerous levels.

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