Why does coffee cause stomach pain for some while helping others live longer? From the energy-boosting effects of caffeine to the calorie counts in your favorite Starbucks drinks, explore the true impact of coffee on the body.
Coffee is an extremely popular beverage, and you may be one that drinks it for the caffeine jolt. In fact, the U.S. Department of Health and Human Services notes that caffeine is the world's most widely consumed psychoactive substance, and eight out of 10 U.S. adult caffeine users are coffee drinkers.
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If you've ever craved a cup of coffee to get yourself going in the morning, you know the appeal of caffeine. According to Columbia University Health Services, caffeine is consumed by as much as 90 percent of the world population in one form or another.
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