Energy Drinks: Caffeine May Be Only Booster

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John Nordell/The Christian Science Monitor via Getty Images(NEW YORK) — There’s only one ingredient in those popular energy drinks that’s proven to give you a mental or physical boost, research shows, according to the New York Times: the caffeine.

One researcher says you can get the same benefit from a cup of coffee.

Americans now spend $10 billion each year on energy drinks.

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