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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.
Coffee and Heart Failure A recent meta-analysis suggests that people who drink 1 to 4 cups of coffee per day have a reduced risk of developing heart failure. This apparent benefit of drinking coffee is lost when five or more cups of coffee are consumed per day.