Microplastics and Heart Attacks: What the New 2026 Study Found

Last updated: July 17, 2026

What the new July 2026 study actually found

On July 15, 2026, researchers led by Professor Emanuele Barbato at Sapienza University of Rome published a study in the European Heart Journal (Paolisso et al.) that did something simple and pointed: they measured micro- and nanoplastics in the blood of people at three different stages of heart health and compared the loads.

The 61 participants fell into three groups: people admitted with a STEMI (an ST-elevation myocardial infarction, the most serious kind of heart attack), people with chronic coronary syndrome (stable, long-standing heart disease), and people with no coronary artery disease at all. The heart-attack group had both the highest concentration and the widest variety of plastic polymers in their blood. The healthy-artery group had the least.

One detail from the study matters more than the headline: the people who both smoked and lived with higher air-pollution exposure almost all had plastics in their blood, while only about 12.5% of non-smokers with lower pollution exposure did. Smokers were roughly six times more likely to test positive. That is a clue about how the plastics get in, and a reason to be careful about what the study can and can't prove.

Why this landed so hard: the 2024 NEJM study it echoes

The reason this new paper got wall-to-wall coverage is that it lines up with the single most alarming microplastics finding to date. In March 2024, Marfella et al. published a study in the New England Journal of Medicine that examined the fatty plaque surgically removed from the carotid arteries of 257 patients. They found micro- and nanoplastics embedded in the plaque of 58% of them.

Then they followed those patients for about 34 months. The people with plastics in their artery plaque had a 4.5 times higher rate of the combined outcome of heart attack, stroke, or death from any cause (hazard ratio 4.53) than the people whose plaque was plastic-free. That is a very large effect for an environmental exposure, and it is the study that turned microplastics from an ecological worry into a cardiovascular one.

The July 2026 study doesn't replace the NEJM one, it complements it from a different angle. NEJM looked at plastic in the plaque; the new study looks at plastic circulating in blood and shows it tracks with how sick the heart is. Two independent teams, two different tissues, same direction. That consistency is what makes researchers take it seriously, even while they caution against over-reading it.

The three studies at a glance

Does this prove microplastics cause heart attacks? No, and here's why

This is the part most headlines skip. Everything above is correlation. Sick hearts have more blood plastic, and plaque with plastic in it is more dangerous, but no study has shown that removing plastic lowers risk, because that experiment is essentially impossible to run on people. Three honest caveats:

• Small samples. 61 people in the new study is enough to detect a difference but not to rule out chance or untangle causes.
• Confounding. Plastic exposure rides along with smoking, air pollution, ultra-processed diet, and lower income, all independent heart-disease drivers. The study even shows the smoking link directly. Some of the “plastic effect” may be those other things wearing a plastic costume.
• Reverse direction is possible. A damaged, inflamed cardiovascular system might trap or retain particles differently than a healthy one, so the heart attack could partly drive the reading rather than the other way around.

None of that makes the finding meaningless. A plausible biological mechanism plus consistent human associations across independent teams is exactly how a risk factor first shows up before the causal proof arrives, it is the stage tobacco and air pollution were once at. The rational stance is neither panic nor dismissal: treat microplastics as a probable, modifiable cardiovascular risk factor and act proportionately.

The plausible mechanism

Why would plastic particles hurt arteries? The leading hypothesis is chronic inflammation. Nanoplastics are small enough to cross from the gut and lungs into the bloodstream, and lab and animal work shows they can lodge in the vessel wall, be engulfed by immune cells, and trigger a low-grade inflammatory response, the same process that destabilizes atherosclerotic plaque and precipitates heart attacks. The particles may also ferry adsorbed chemicals (bisphenols, phthalates) that have their own cardiovascular signals. This is mechanistically coherent, which is why cardiologists aren't dismissing the human data outright.

What actually reduces your exposure (in order of payoff)

If you take one action from this study, make it a real one. Exposure reduction is where the evidence is strongest and the cost is lowest, and the ranking is not what the supplement ads suggest.

• Filter your drinking water. A certified reverse-osmosis or microplastic-rated pitcher removes the bulk of waterborne particles. See our water filters compared guide.
• Stop heating food in plastic. Heat is the single biggest multiplier of microplastic release. Never microwave in plastic, and don't pour boiling liquid into it, glass or stainless instead.
• Cut bottled water. PNAS (2024) found roughly 240,000 plastic particles per liter in bottled water, an order of magnitude more than most tap. It is one of the largest single ingestion sources.
• Ditch plastic food storage for glass or steel, especially for hot, fatty, or acidic foods.
• Address the confounders that ride with plastic: don't smoke, and reduce indoor air pollution, the study suggests these amplify blood-plastic levels dramatically.

What's not on the list: “microplastic detox” supplements, cleanses, or postbiotics. There is no human evidence any of them clear plastics from tissue, see our honest microplastics detox breakdown before spending money on one.

Who should care most

The signal is strongest for people who already carry cardiovascular risk: smokers, people in high air-pollution areas, and anyone with existing heart disease, high blood pressure, or a strong family history. For that group, exposure reduction is a cheap add-on to the things that matter far more, not smoking, controlling blood pressure and cholesterol, exercise, and diet. Microplastics are a rational thing to reduce; they are not a reason to ignore the established basics, which still dwarf any plastic effect measured so far.

For the deeper science on how these particles get into artery walls, see our explainer on microplastics in arterial plaque, and on where they end up in the body, microplastics in human blood and how long microplastics stay in your body.