Two black liquids keep America going—oil and coffee. That’s how one university professor recently described our addiction to caffeine. You could argue that coffee runs the entire world. An estimated 400 billion cups of the world’s most popular beverage are consumed every year.
The amount of caffeine many people now consume, particularly in America, has health officials concerned. Gone are the moderate 1950s, when caffeine consumption meant occasionally enjoying a five-ounce coffee after lunch. People today put down three times that amount with just one “medium”-size coffee at Starbucks.