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Your Morning Cup of Coffee: Bad for the Heart? Plus, Win Our Book!

We review the confusing research surrounding your morning cup of java.

Heart 411

Want to win our new book, Heart 411, which hits shelves today? Leave a comment at the end of this story telling us how many cups of coffee you drink daily, and you'll be automatically entered to win(contest rules, here)!

Coffee has a bad reputation when it comes to heart health. Some contend that it causes high blood pressure, while others link it to heart attacks. We have good news for America’s 150 million coffee drinkers. Relax and have your morning cup of coffee—it won’t hurt your heart. 

Coffee and health throughout history

Interest in the links between coffee and health dates back hundreds of years. In seventeenth-century Europe, coffee was thought to aid digestion and gout but cause impotence and paralysis—not a favorable trade-off, and also not correct. Others have linked coffee to short stature and the development of cancer; these claims have also been refuted. Today most scientific studies and media headlines concerning coffee focus on its relationship to the heart.

COLUMN: Coffee May Squelch Skin Cancer, by Dr. Oz & Dr. Roizen

Coffee and blood pressure

The most common heart-related claim is that coffee causes or aggravates high blood pressure (hypertension). In fact, among people who are not regular coffee drinkers, the caffeine from two cups of coffee increases blood pressure by 2 to 3 mm Hg, a relatively small change. This effect is short-lived and is usually absent among those who drink coffee regularly.

Coffee does not hurt your heart rhythm

Other “coffee opponents” cite effects of coffee on heart rate and rhythm. Anybody who has a cup of coffee in the morning recognizes that coffee can cause a slight increase in heart rate. Like the blood pressure effect, this is temporary and harmless. Claims that coffee often triggers irregular heart rhythms (arrhythmias) like atrial fibrillation are flat-out wrong.  And those who already have atrial fibrillation generally experience no ill effects from coffee.

Does coffee cause heart attacks?

The biggest concern is that coffee might be harmful to those with pre-existing coronary heart disease (blockages in arteries of the heart). The specific question raised by recent scientific studies and media reports is whether coffee can trigger a heart attack in people with coronary heart disease

In fact, the answer is “yes.” But the risk of coffee triggering a heart attack is tiny and applies only to a small minority of individuals who are not habitual coffee drinkers and who may have a particular genetic profile. The short message here—the risk of coffee triggering a heart attack is so small that it is not worth worrying about it. 

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