Are you one of the millions of Americans who can't start the day without a steaming cup of coffee? Growing dependence on that morning caffeine jolt has made the U.S. one of the biggest coffee consumers in the world, swallowing about one-third of the world's coffee production. Is that good or bad? Hard to tell. Decades of conflicting research about the potential benefits and harm of the popular bean have created so much confusion that most coffee drinkers have long since given up trying to sort it out.
But if you like your brew and you like it strong, you might...
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