The average American drinks about 200 milligrams of caffeine a day, according to a 2017 study, which falls within the government and health group recommendations.
About 100 to 150 milligrams, which is equivalent to one to 1½ cups of coffee, is a rough estimate of how much caffeine is needed to give a healthy energy boost - though it depends on the individual, Astrid Nehlig, an emeritus research director at the French National Institute of Health and Medical Research, told the Wall Street Journal.
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