DALLAS - July 20, 2026 - The American Heart Association has released a new scientific statement concluding that for most adults, consuming up to 400 mg of caffeine per day—equivalent to up to five 8-ounce cups of caffeinated coffee—is safe and associated with a lower risk of several cardiovascular conditions. However, higher doses found in energy drinks and shots may increase risks of high blood pressure and arrhythmias.
The statement, published today in the AHA’s journal Circulation, reviews the latest research on caffeine and cardiovascular health. “Caffeine consumed in coffee is a key part of daily life for millions of people,” said Gregory M. Marcus, M.D., M.A.S., FAHA, chair of the statement writing group. “For most adults, intake of up to 400 mg of caffeine per day is safe and does not increase cardiovascular risk. However, high doses of caffeine, such as those found in energy drinks including energy shots, may have harmful effects.”
The statement highlights that coffee contains bioactive compounds with antioxidant and anti-inflammatory properties that may contribute to health benefits. Drinking 2-4 cups of caffeinated coffee daily was linked to lower risks of heart disease, heart failure, and stroke. One to three cups daily was not associated with increased risk of atrial fibrillation, though it may increase premature ventricular contractions. However, adding sugar, syrups, or cream likely reduces benefits.
Energy drinks pose particular concern. With 40-69 mg of caffeine per fluid ounce—three to four times more than regular coffee—they can significantly raise blood pressure and trigger abnormal heart rhythms, especially in younger, healthy adults. The statement notes that other ingredients in these products may accelerate caffeine’s effects.
Effects on blood pressure vary. Drinking 1-3 cups daily was linked to increased risk of developing high blood pressure in people with optimal levels, while more than 3 cups was associated with lower risk. High doses from energy drinks can markedly increase blood pressure, particularly in those already hypertensive. Regarding cholesterol, unfiltered coffee (espresso, French press) contains cafestol, which can raise LDL (“bad”) cholesterol; paper-filtered and instant coffee do not.
The statement emphasizes individual variability. “There is no ‘one-size-fits-all’ strategy for safe caffeine consumption,” Marcus said. Factors like genetics, metabolism, age, and medications affect how people respond. The AHA calls for more randomized trials on caffeine’s cardiovascular effects, especially from energy drinks and other sources. The statement did not include formal recommendations, as it is not a guideline, but informs future dietary guidance.
For more information, visit the full manuscript and the AHA’s Caffeine and Heart Disease page.
