Good news for coffee lovers! Mostly. A new scientific statement published on July 20 in the peer-reviewed journal Circulation offers encouraging news for coffee enthusiasts. Researchers have concluded that most adults can safely consume up to five cups of coffee—equivalent to approximately 400 mg of caffeine—each day without raising their risk of cardiovascular disease. The study highlights that these benefits are associated with black coffee, as the addition of dairy products, flavored syrups, and high amounts of sugar can significantly increase caloric intake and potentially negate the health advantages of the beverage itself.
While the five-cup guideline applies to standard coffee, the authors caution that it does not extend to higher doses of caffeine. Dr. Gregory M. Marcus, a professor of medicine at the University of California, San Francisco School of Medicine and associate chief of cardiology for research at UCSF Health, emphasized that high-caffeine products such as energy drinks and energy shots should be avoided. Dr. Marcus, who served as the chair of the American Heart Association’s scientific statement volunteer writing group, warned that these products can contain three to four times the caffeine found in regular coffee per fluid ounce, potentially leading to harmful effects on the heart, including irregular heart rhythms, arrhythmia, or high blood pressure.
Conversely, the research noted that consuming caffeinated coffee without additives is linked to a lower risk of stroke, heart failure, Type 2 diabetes, heart disease, and certain irregular heart rhythms. The review also examined the impact of different brewing methods on cholesterol levels. It found that unfiltered coffee, such as French press, espresso, boiled, or Turkish coffee, contains specific components linked to higher levels of "bad" cholesterol.
The authors reminded consumers that while coffee is the primary source of caffeine for many, other items like chocolate, tea, and soda also contribute to daily intake. Although research suggests that caffeine consumption may be associated with certain cardiovascular benefits for some people, it’s important to remember that there is no ‘one-size-fits-all’ strategy for safe caffeine consumption, Marcus said. People can respond very differently to caffeine based on various factors, such as age, medications, underlying health conditions, genetics and how quickly their bodies metabolize it. Further research is necessary to better understand how caffeine from diverse sources affects different populations.
