Study Finds Microplastics in Blood of 84% of Severe Heart Attack Patients

Researchers in Italy found that patients suffering severe, active heart attacks were far more likely to have detectable micro- and nanoplastics in their blood than patients with stable heart conditions or healthy arteries.

The study, led by Dr. Raffaele Marfella of the University of Campania Luigi Vanvitelli in Naples, analyzed blood samples drawn directly from the coronary arteries of 61 patients undergoing angiograms, a standard imaging procedure used to check blood vessels for blockages. It was published in the European Heart Journal.

Among patients having an active, severe heart attack, nearly 84% had detectable micro- and nanoplastics in their blood, according to the New York Post's coverage of the findings. That number dropped to 40% in patients with chronic but stable heart disease, and to just 32% in patients with normal coronary arteries.

Polyethylene, the plastic used in everyday items like grocery bags and water bottles, showed up in 97% of the patients who tested positive for any plastic at all.

What the Study Actually Shows

This is an observational study. It found an association between plastic particles in the blood and severe cardiac events. It did not establish that plastic caused those events.

Michelle Routhenstein, a preventive cardiology dietitian at EntirelyNourished.com who was not involved in the research, told Fox News Digital the findings are notable but limited. "These findings are interesting and highlight the importance of paying attention to environmental factors that may contribute to inflammation and blood vessel injury, but they do not prove that plastics cause heart attacks," she said.

Routhenstein pointed out the sample size was small, 61 patients, and all from one country. "We can't assume the findings apply to everyone," she said.

There's also a confounding problem baked into the data. Smoking emerged as the single strongest predictor of detectable plastic particles in patients' blood, according to the study. Smoking is independently linked to both heart disease and higher plastic exposure, which makes it hard to say how much of the plastic-heart attack link is really about plastic versus about other risk factors that track together, like smoking and air pollution.

Anyone reading this and concluding "plastic bags cause heart attacks" is getting ahead of the data. Correlation between plastic particles and cardiac events, in a small sample, with major confounders like smoking not fully isolated, is not the same as a causal mechanism proven in a lab.

Fits a Pattern of Prior Research

The Naples findings aren't happening in a vacuum. Routhenstein noted they align with earlier research that detected microplastics embedded directly in arterial plaque, the fatty buildup inside blood vessels that drives heart attacks and strokes. That prior work gives the new blood-sample findings credibility.

Still, the field is young. Microplastics research has exploded over the past several years as better detection methods have made it possible to find these particles in human tissue at all. Scientists are still working out basic questions: how much plastic is actually in the average person, where it accumulates, and whether it does measurable biological damage or just sits there inert.

What People Can Actually Do

Routhenstein's practical advice is modest and doesn't require alarm. She recommends people take stock of where plastic shows up in daily life and swap it out where reasonably possible, replacing plastic food storage containers with glass, for instance, and being more careful about how food and water are prepared and stored.

None of that is a cure. It's risk reduction on the margins, the same logic applied to diet, exercise, and not smoking.

The unresolved question is the big one: does removing plastic exposure actually lower heart attack risk, or is plastic just another marker that tags along with the same lifestyle and environmental factors, like smoking and pollution, that were already known to drive cardiovascular disease? Answering that will require larger studies, across more countries, with better controls for confounders. That work hasn't been done yet.