Maximum is unknown: Moderate coffee drinking is safe, but the maximum safe amount is unknown. Moderate is a vague word, but probably means 3-4 cups a day (24-32 ounces). Heavy drinking is likely 6 cups or more a day, and caffeine can cause unwanted symptoms such as increased blood pressure, increased heart rate, and sometimes irregular heart beats. Caffeine in larger doses is a mildly addictive stimulant.
Answered 8/21/2017
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