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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.
Caffeine occurs naturally in more than 60 plants including coffee beans, tea. leaves, kola nuts used to flavor soft drink colas, and cacao pods used to make. chocolate products. Man-made caffeine is sometimes added to foods, drinks, and. medicines. Ninety percent of people in the world use caffeine in one form or. another. In the U.S., 80 percent of adults consume caffeine every day â the. average adult has an intake of 200 mg per day, the amount in two 5-ounce cups. of coffee or four sodas. A study of 7th, 8th, and 9th grade students in Ohio found. that students took in an average of 53 mg of caffeine per day, but almost one in.