DALLAS — The American Heart Association has released a new scientific statement on caffeine and cardiovascular health, offering guidance on safe consumption levels and highlighting potential risks from high-caffeine products. The statement, published today in the AHA’s journal Circulation, concludes that for most adults, up to 400 mg of caffeine per day — equivalent to about five 8-ounce cups of brewed coffee — is safe and may even be beneficial.
The review of recent research found that moderate coffee consumption, without added sugars or cream, was linked to a lower risk of type 2 diabetes, heart disease, stroke, heart failure, and some irregular heart rhythms. However, the statement warns that high doses of caffeine, such as those found in energy drinks and energy shots, can increase blood pressure and promote arrhythmias.
“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 notes that studying caffeine’s effects is challenging because coffee contains many bioactive compounds that may contribute to health benefits. Observational studies cannot prove cause and effect, and added ingredients like sugar and cream may offset potential benefits.
Key findings include: 1–3 cups of coffee daily may temporarily raise blood pressure but long-term consumption is associated with lower hypertension risk; filtered coffee does not raise cholesterol, while unfiltered coffee (French press, espresso) contains cafestol, which can increase LDL cholesterol; moderate coffee intake is linked to lower risk of atrial fibrillation but may increase premature ventricular contractions; and 2–4 cups daily is associated with reduced risk of heart disease, heart failure, and stroke.
The statement emphasizes that individual responses to caffeine vary due to genetics, metabolism, age, and medications. People with underlying conditions or who experience palpitations should consult their healthcare team. The AHA’s 2026 Dietary Guidance did not include specific caffeine recommendations due to insufficient rigorous data, but this statement provides a foundation for future guidelines.
More research is needed on energy drinks and other caffeinated products. The statement calls for randomized controlled trials to clarify how different sources of caffeine affect cardiovascular health across diverse populations.
