For most people, a shot or two of espresso a day is not bad for your heart. But the picture gets more complicated at higher amounts. Research on a large Italian cohort found that drinking more than two cups of espresso daily was associated with a 37% to 52% higher risk of coronary heart disease compared to drinking less than one cup, with risk climbing steadily as intake increased.
Whether espresso helps or harms your heart depends on how much you drink, how your body handles caffeine, and whether you already have cardiovascular issues like high blood pressure. Here’s what the evidence actually shows across the areas that matter most.
What Espresso Does to Blood Pressure
Espresso causes a short-term spike in blood pressure, and it’s more potent than you might expect. In one study highlighted by Harvard Health, a single espresso raised systolic blood pressure (the top number) by about 13 mmHg and diastolic (the bottom number) by about 7 mmHg in people who weren’t regular coffee drinkers. That’s a meaningful jump, roughly equivalent to what some blood pressure medications are designed to lower.
Interestingly, when researchers gave subjects pure caffeine equivalent to what’s in espresso, it only raised systolic pressure by about 6 mmHg. Decaffeinated espresso raised it by 12 mmHg. That means something else in espresso besides caffeine is driving the blood pressure effect. Scientists suspect other bioactive compounds in the brew play a role, though the exact mechanism isn’t fully understood.
If you drink espresso regularly, your body does adapt. Research on arterial stiffness (a measure of how flexible your blood vessels are) found that non-habitual coffee drinkers experienced significantly larger increases in arterial stiffness after a cup compared to daily drinkers. Regular consumers still saw some increase, but their arteries essentially learned to tolerate the stimulus better over time.
Cholesterol and Unfiltered Brewing
Espresso is an unfiltered brewing method, and that distinction matters for your cholesterol. Coffee contains two oily compounds called diterpenes that raise LDL (“bad”) cholesterol by interfering with how your body breaks down fats. Paper filters catch almost all of these oils: a cup of filtered coffee contains roughly 0.02 mg of each compound, while a cup of boiled (unfiltered) coffee contains about 7.2 mg of each. Espresso falls somewhere in between, with intermediate levels because the water passes through grounds quickly under pressure.
The cholesterol impact is dose-dependent. For every 10 mg of these compounds consumed, total cholesterol rises by about 0.13 mmol/L. At one or two espressos a day, this effect is modest. But heavy consumption of unfiltered coffee, at nine or more cups daily, has been linked to up to a 25% increased risk of cardiovascular death. Filtered coffee, by contrast, actually shows some protective effects: the phenolic acids that pass through a paper filter can help your body move cholesterol out of artery walls.
One surprising finding from the Italian cohort study: even though espresso drinkers who consumed more than two cups daily had higher coronary heart disease risk, their plasma lipid levels didn’t actually change. That suggests espresso’s heart risk at higher doses isn’t entirely explained by cholesterol and likely involves other pathways, possibly the blood pressure and arterial stiffness effects described above.
Heart Rhythm and Arrhythmia Risk
Many people worry that espresso will trigger an irregular heartbeat, and caffeine is one of the most commonly reported triggers among people who already have atrial fibrillation (AF). In one randomized trial, participants who consumed coffee had a 54% increase in premature ventricular contractions (extra heartbeats originating in the lower heart chambers) compared to those who avoided caffeine.
But the population-level data tells a different story for people without existing arrhythmias. Multiple large epidemiological studies have found that moderate caffeine consumption is actually associated with a lower risk of developing atrial fibrillation in the first place. One analysis found that AF incidence dropped by 6% for every additional 300 mg of daily caffeine intake, and the Physicians’ Health Study found that men drinking one to three cups of coffee per day had a lower AF risk than abstainers.
The takeaway is that individual responses vary widely. Genetics play a major role in how your body metabolizes caffeine. If you notice palpitations, a racing heart, or skipped beats after espresso, that’s your body telling you something worth listening to. But if you drink espresso regularly without symptoms, the evidence doesn’t suggest you’re accumulating hidden arrhythmia risk.
Who Should Be Especially Careful
People with severely high blood pressure (readings of 160/100 or higher) face a specific and serious risk. A study covered by the American Heart Association found that people in this category who drank two or more cups of coffee daily doubled their risk of dying from cardiovascular disease compared to those who didn’t drink coffee. One cup a day didn’t show this effect, and neither did green tea. The risk appears concentrated at the intersection of heavy consumption and already-dangerous blood pressure levels.
For people with blood pressure in the normal or mildly elevated range, moderate espresso consumption doesn’t carry this same outsized risk. But if you’re actively trying to lower your blood pressure through medication or lifestyle changes, it’s worth knowing that espresso’s acute pressure spikes could be working against your efforts, particularly if you’re not a habitual drinker whose body has adapted to the stimulus.
How Much Is Too Much
The FDA considers 400 mg of caffeine per day safe for most adults. A standard shot of espresso contains roughly 63 mg of caffeine, which means you could theoretically drink about six shots before hitting that ceiling. But the coronary heart disease data from the Italian cohort suggests the sweet spot is lower than that: risk started climbing meaningfully above two cups daily, with a statistically significant 52% increase at four or more cups.
If you enjoy espresso and have no cardiovascular conditions, one to two shots a day sits comfortably within what the evidence supports as safe. If you’re drinking more than that, the risk isn’t dramatic for otherwise healthy people, but it does trend upward in a dose-dependent way. Switching some of your intake to paper-filtered coffee would reduce your exposure to the cholesterol-raising oils while keeping the caffeine and antioxidant benefits largely intact.