The real truth is that most people are already consuming too much energy, which is why there’s an obesity problem. (Think about it.) So adding to your energy excess by guzzling a calorie- and sugar-laden drink doesn’t make a lot of sense. In fact, ask yourself this: Is it a lack of incoming sugar that’s causing you to be tired-or is it that you’re consuming too much of it in the first place? Chances are, it’s the latter. Our advice: If you feel you need a boost, reach for unsweetened beverage that contains only caffeine-like a black coffee from Dunkin’ Donuts. It has zero grams of sugar, 146 mg of caffeine, and just 20 calories-all for about 2 dollars.

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