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To best minimize your risk, consume less than 100 milligrams of caffeine per day, or no more than 1 to 2 cups of coffee. Caffeine may also have adverse impacts in children, such as disturbing their sleep, and intake should be limited to 2.5 milligrams of caffeine per kilogram of their body weight per day.
Around 90 percent of Americans consume caffeine every single day in one form or another. More than half of all American adults consume more than 300 milligrams of caffeine every day, making it America's most popular drug by far [source: Johns Hopkins]. But the U.S. is far from the lead when it comes to national caffeine consumption. According to a 2010 report by commodities analysts for Businessweek, Scandinavian nations such as Finland consume more caffeine per capita -- mostly in coffee -- than any other country.