DALLAS - A new scientific statement from the American Heart Association, published today in the journal Circulation, provides updated guidance on caffeine consumption and cardiovascular health. The statement, based on a comprehensive review of recent research, indicates that for most adults, consuming up to 400 mg of caffeine per day—equivalent to about five 8-ounce cups of brewed coffee—is safe and may be linked to a lower risk of several cardiovascular conditions, including heart failure, heart disease, and stroke.
However, the statement warns that higher doses of caffeine, particularly those found in energy drinks and energy shots, can increase the risk of high blood pressure and irregular heart rhythms. “Caffeine consumed in coffee is a key part of daily life for millions of people, and for most adults, intake of up to 400 mg of caffeine/day is safe and does not increase cardiovascular risk,” said Dr. Gregory M. Marcus, chair of the statement writing group. “However, high doses of caffeine, such as those found in energy drinks, may have harmful effects on the heart and should be avoided.”
The statement emphasizes that the health effects of coffee may be due to compounds other than caffeine, such as antioxidants and anti-inflammatory agents. Adding sugar, cream, or flavored syrups likely reduces potential benefits. The research also highlights individual variability in caffeine metabolism, influenced by genetics, age, and medications, underscoring that there is no one-size-fits-all recommendation.
Key findings include that drinking 1-3 cups of coffee daily was associated with a lower risk of atrial fibrillation but also more premature ventricular contractions. Higher caffeine intake from energy drinks (which can contain 3-4 times more caffeine per ounce than coffee) was linked to increased blood pressure and arrhythmias, especially in young, healthy adults. The statement calls for more research on different caffeine sources and their long-term effects.
The full scientific statement is available at https://www.ahajournals.org/doi/10.1161/CIR.0000000000001234. For more information on heart health, visit https://www.heart.org.
