Is coffee good or bad for your heart? A team of researchers from Qatar and Egypt reviewed 38 studies covering almost 2.9 million people to answer that question, published in BMC Cardiovascular Disorders. The honest answer: it depends entirely on which heart problem you look at.
Heart attack is the less friendly side of your coffee cup. Combining data from six studies on heart attack, the researchers found a clear link between high coffee consumption and greater risk, a 48% increase when comparing heaviest drinkers to lightest drinkers. Unlike other results in the study, this one showed little variation across the different studies analyzed, which gives it extra weight.
But stroke tells the opposite story. When the analysis turned to stroke, the pattern flipped. High coffee consumption was linked to a significantly lower risk, especially for the ischemic type, the most common one. The same did not hold for hemorrhagic stroke, where no relationship appeared at all.
Arrhythmias came out ahead too, though with important caveats. Pooling three studies on arrhythmias in general, high coffee consumption appeared linked to lower risk. But when researchers drilled down into specific arrhythmia types (atrial fibrillation, supraventricular tachycardia, ventricular tachycardia), that protection stopped being statistically significant. A sign the overall result should be read with some caution.
In people with hypertension, caffeine was even linked to fewer cardiovascular deaths. This might be the study’s most striking finding: among people with high blood pressure, high caffeine intake was associated with 32% fewer cardiovascular deaths compared to low intake. That relationship did not appear in the general population or in people with diabetes or prediabetes, suggesting the effect is specific to that group.
There was no link found with coronary heart disease overall or with heart failure, even though both are among the most common cardiovascular conditions.
The authors themselves insist this isn’t a simple “good” or “bad” story. They describe coffee and caffeine’s cardiovascular effects as “complex and outcome-specific, rather than consistently harmful or beneficial.” Their practical conclusion: broadly restricting coffee in the healthy general population probably isn’t justified, while moderation does make sense for people with diagnosed ischemic heart disease or particular sensitivity to caffeine.
This is correlation, not a controlled experiment, and that matters. The 38 included studies are mostly cohorts and some case control studies, not randomized clinical trials. The authors flag several limitations themselves: coffee and caffeine intake was self reported, measured at a single point in time without tracking how habits changed, only English language studies were included, and “high consumption” categories varied wildly between studies (in some, “high” meant 2 cups a day, in others, 8). All of this means the associations found are statistically solid, but do not prove direct causation.
Source: Shaban EE, Elmelliti H, Shaban A, et al. “Coffee, caffeine, and cardiovascular health: navigating risks and benefits, an updated systematic review and meta-analysis.” BMC Cardiovascular Disorders, 2026. DOI: 10.1186/s12872-026-05693-0.
