Your daily coffee is probably fine for your heart — and may even help it. Energy drinks are a different story. That is the message of a new scientific statement from the American Heart Association, published in its journal Circulation.
The statement concludes that caffeine intake up to about 400 milligrams a day — roughly three to five cups of coffee — is generally safe for most adults, and that coffee consumption is associated with lower risks of heart disease, stroke, heart failure, and type 2 diabetes.
Not all caffeine is equal
The concern is concentration. Energy drinks and “energy shots” pack far more caffeine per ounce than brewed coffee — about 40 to 69 milligrams per fluid ounce, versus roughly 9 to 21 milligrams for regular coffee. That means a small serving can deliver a large, rapid dose, often alongside other stimulants and sugar.
“High doses of caffeine, such as those found in energy drinks including energy shots, may have harmful effects on the heart and should be avoided,” said Dr. Gregory M. Marcus, who chaired the writing group.
An important caveat
The AHA is careful to note that much of the underlying research is observational — it identifies associations, not cause and effect — and it calls for more rigorous randomized trials. In plain terms: the data suggest moderate coffee is compatible with a healthy heart, but they do not prove coffee itself is protective.
What it means for you
For most healthy adults, a few cups of coffee a day appear reasonable, while concentrated energy drinks are worth approaching with caution — especially for people with heart conditions. As always, individual circumstances vary, so talk to your doctor about what is right for you. This article is for general information and is not medical advice.