A new scientific statement from the American Heart Association, published in the peer-reviewed journal Circulation, indicates that consuming up to five cups of caffeinated coffee per day is safe for most adults and may reduce the risk of several cardiovascular conditions.
Study Findings on Coffee and Cardiovascular Health
The statement, chaired by Dr. Gregory Marcus, professor of medicine at the University of California, San Francisco, reviewed the latest research on caffeine and heart health. It found that up to 400 mg of caffeine daily—equivalent to three to five 8-ounce cups of black coffee—does not increase cardiovascular risk for most adults. In fact, moderate consumption was linked to lower risks of heart failure, coronary heart disease, stroke, and atrial fibrillation.
However, high-dose caffeine sources like energy drinks and shots were associated with increased blood pressure and irregular heart rhythms. Energy shots can contain 40-69 mg of caffeine per fluid ounce, three to four times more than regular coffee.
Coffee Additives and Cholesterol Concerns
The research noted that adding sugar, syrups, milk, or cream may reduce coffee's health benefits. Additionally, unfiltered coffee (espresso, French press, Turkish coffee) contains cafestol, which can raise LDL or 'bad' cholesterol. Paper-filtered or instant coffee does not contain cafestol.
Drinking two to four cups daily was linked to lower heart disease, heart failure, and stroke risk. But more than four cups may increase heart failure risk. Interestingly, one to three cups daily was associated with a slight increase in high blood pressure risk, while over three cups showed lower risk.
Individual Responses to Caffeine Vary
Dr. Marcus emphasized that there is no one-size-fits-all approach: 'What may be a reasonable amount for one person could cause unwanted effects, such as heart palpitations, anxiety or sleep disruption, in another.' He advised paying attention to personal tolerance and consulting a healthcare team.
The statement also highlighted that randomized trials show coffee consumption is linked to a lower risk of atrial fibrillation but a higher risk of premature ventricular contractions.
