Coffee drinkers who have spent years feeling guilty about their second or third cup can breathe a little easier: the American Heart Association says drinking up to five 8-ounce cups of caffeinated coffee a day, roughly 400 milligrams of caffeine, is safe for most adults and may even carry real cardiovascular benefits.

The conclusion comes from a new scientific statement the AHA published July 20 in its flagship journal, Circulation, reviewing the accumulated evidence on caffeine, coffee and heart health. Scientific statements are formal reviews of cumulative research designed to guide clinical practice, and while they carry substantial weight, they are distinct from official treatment guidelines.

A More Generous Limit Than Previous Guidance

The new figure marks a notable shift from earlier research. A 2022 study had set the safe daily limit closer to three and a half cups, according to reporting on the updated statement. Dr. Sreenivas Gudimetla, a cardiologist with Texas Health Fort Worth, explained the change by pointing to what researchers call a J-curve relationship between coffee and health outcomes. "There's what's called a J-curve hypothesis, meaning you don't get the benefit from coffee unless you consume moderate amounts of coffee," Gudimetla said. "Moderate amounts of coffee seems to be sort of that sweet spot right now."

Dr. Gregory Marcus, who chaired the statement's writing group and serves as associate chief of cardiology for research at UC San Francisco Health, summarized the findings directly: "Caffeine consumed in coffee is a key part of daily life for millions of people, and in our review of the most recent research, for most adults, intake of up to 400 mg of caffeine per day, the equivalent of up to 5 cups of........

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