What the latest science says about caffeine's influence on your heart, memory, sex life, and exercise performance.
Americans are jolted with caffeine. On average, about 80% of adults take some form of caffeine every day, according to the FDA, usually from coffee, tea, soda, or energy drinks.
But does all that caffeine have any effect on your health — either good or bad? "While caffeine can give you a temporary mental and physical boost, its impact depends on how much you consume and the source," says Dr. Stephen Juraschek, an internal medicine specialist at Harvard-affiliated Beth Israel Deaconess Medical Center.
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