Energy Drink Overload

THAT ROCKET FUEL you guzzle to power you through your workout could be the reason you're feeling anxious later in the day or tossing and turning well into the night. A recent Spanish study found that while athletes who downed the equivalent of three cans of energy drinks before a sports competition improved performance between 3-7%, many also reported insomnia, feelings of nervousness, and a heightened level of stimulation.

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Caffeine levels in energy drinks can range from about 40 to 242 milligrams per serving, with some packing more than one serving, according to a recent Consumer Reports article. If you find yourself feeling the effects, try reading labels to cut back on the caffeine and steer clear of the stimulant at least six hours before bed. -Diana Kelly

POWER UP YOUR GREENS