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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.
According to the recent U.S. Dietary Guidelines, 400 milligrams of caffeine a day can be part of a healthy diet for most adults. Thatâs two to four eight-ounce cups of most coffees. The Food and Drug Administration says 600 milligrams a day is too much. An eight-ounce cup of Death Wish has 472 milligrams. And for many people a âcupâ of coffee ranges from 12 to 20 ounces. (The table below lists the caffeine content of different products per fluid ounce and per serving size.)