Study Shows Microplastics in 84% of Severe Heart Attacks

CLIFF NOTES:

• Researchers tested coronary blood from 61 patients in Italy.
• Microplastics appeared in 84.2% of severe heart attack patients.
• Polyethylene was found in 97% of patients who tested positive.
• Smoking was the strongest independent predictor of detectable plastics.
• The study found an association but did not prove that plastics cause heart attacks.

A new Italian study found microplastics and nanoplastics in the coronary blood of 84.2% of patients experiencing a severe heart attack. The particles appeared less often in patients with chronic coronary disease or normal arteries. The findings show an association, but they do not prove that plastic exposure causes heart attacks.

What did the microplastics and heart attacks study find?

Researchers examined 61 adults who underwent coronary angiography for suspected coronary artery disease.

The patients were divided into three groups:

• 19 patients with an ST-segment elevation myocardial infarction, or STEMI
• 20 patients with chronic coronary syndromes
• 22 patients with normal coronary arteries

A STEMI is a serious heart attack caused by a major blockage that sharply reduces blood flow to part of the heart.

Micro- and nanoplastics were detected in:

• 84.2% of STEMI patients
• 40% of patients with chronic coronary syndromes
• 31.8% of patients with normal coronary arteries

Patients suffering acute heart attacks also had higher plastic concentrations and a wider range of plastic polymers in their blood.

How did researchers test the patients’ blood?

The research team collected samples from peripheral arteries and from blood vessels supplying the heart.

The scientists used pyrolysis-gas chromatography-mass spectrometry and laser direct infrared spectroscopy to identify and measure plastic particles.

The same types of polymers generally appeared in both peripheral and coronary blood from individual patients. However, the highest concentrations were found in coronary blood, according to the study.

The investigation was conducted at hospitals in Rome and Verona between February and April 2025. Microplastic analysis was completed through the University of Campania Luigi Vanvitelli’s Research Centre on Environmental Pollution and Cardiovascular Diseases in Naples.

The study was published as an advance article in the European Heart Journal in 2026.

Which type of plastic appeared most often?

Polyethylene was the dominant polymer.

Researchers detected polyethylene in 97% of patients who tested positive for micro- and nanoplastics. The material is widely used in products such as plastic bags, bottles, packaging and storage containers.

The researchers also examined other polymers, including polyethylene terephthalate, polypropylene, polystyrene and polyvinyl chloride.

Why could microplastics and heart attacks be connected?

Patients experiencing severe heart attacks had higher levels of two inflammatory markers: interleukin-6 and tumor necrosis factor-alpha.

They also had greater exposure to PM2.5, a form of fine-particle air pollution that can travel deep into the lungs and enter the bloodstream.

The study concluded that microplastic detection often appeared alongside inflammation, air pollution exposure and smoking. That pattern suggests a possible connection between environmental exposure and coronary artery disease, but the researchers did not establish cause and effect.

Michelle Routhenstein, a preventive cardiology dietitian at Entirely Nourished who was not involved in the research, described the findings as part of a growing body of evidence.

“This study adds to emerging research showing the potential role of micro- and nanoplastics in heart disease,” Routhenstein announced.

She also warned against drawing conclusions that the study could not support.

“While these findings are interesting and highlight the importance of paying attention to environmental factors that may contribute to inflammation and blood vessel injury, they do not prove that plastics cause heart attacks,” she said.

What were the study’s main limitations?

The study was cross-sectional and observational. It examined conditions present at one point in time rather than following patients over many years.

Such a study can identify an association, but it cannot determine whether microplastics directly caused a heart attack.

“This was an observational study, so it can only show an association, not cause and effect,” Routhenstein said. “It also included a relatively small group of patients from one country, so we can’t assume the findings apply to everyone.”

The sample contained only 61 patients. Larger studies involving more countries and longer follow-up periods would be needed to determine whether the results apply to broader populations.

How did smoking affect the results?

Smoking history emerged as the only independent predictor of detectable micro- and nanoplastics after the researchers adjusted for other factors.

Patients with a smoking history had substantially greater odds of testing positive. Every patient who had both a smoking history and PM2.5 exposure above 15 micrograms per cubic meter had detectable plastic particles.

This overlap makes the evidence harder to interpret. Smoking and air pollution are already established cardiovascular hazards, and both may increase exposure to plastic particles.

“Factors like smoking and air pollution are also linked to cardiovascular disease and higher plastic exposure, making it difficult to separate the independent effects of microplastics,” Routhenstein said.

The result illustrates the central problem: several risks can move together. One may strengthen another, while the study design cannot separate their effects with certainty.

How does the new research compare with earlier studies?

The findings follow earlier research that detected microplastics and nanoplastics inside arterial plaque.

A 2024 study published in The New England Journal of Medicine examined plaque removed from the carotid arteries of 304 patients. Patients whose plaque contained plastic particles experienced a higher rate of heart attack, stroke or death during approximately 34 months of follow-up.

That earlier research also found polyethylene to be the most common polymer. Like the new study, it identified a serious association without proving that plastic particles directly caused cardiovascular events.

How can daily plastic exposure be reduced?

Routhenstein recommended focusing on practical sources of repeated exposure.

“I would take inventory of your regular sources of microplastic exposure and see where you can reduce or swap them for better alternatives,” she said. “For example, replace plastic food storage containers with glass ones.”

She also advised against heating food in plastic.

“When microwaving or reheating food, use glass or ceramic containers instead of plastic,” she said. “It’s also a good idea to limit plastic water bottles and single-use plastic containers, especially when they’re exposed to heat.”

Reducing plastic exposure does not replace established heart-protection measures such as avoiding tobacco, managing blood pressure, controlling cholesterol and following medical advice.

“Think of reducing plastic exposure as one piece of an overall heart-healthy lifestyle,” Routhenstein said.

What do the findings mean for drinking water?

Microplastics have been detected in bottled water, tap water, food and air. Drinking water is therefore one possible source of exposure, but it is not the only source.

The World Health Organization has said that properly operated drinking-water and wastewater treatment systems can reduce microplastic levels. It has also called for stronger testing methods and more research into the health effects of exposure through water, food and air.

Home filtration performance varies by system. NSF advises consumers to examine the specific contaminant-reduction claims attached to a certified filter rather than assuming that every filter removes the same substances. Some products are independently certified for microplastic reduction under NSF/ANSI standards.

How do reverse osmosis systems and whole-home water conditioners relate?

Reverse osmosis systems use a semipermeable membrane to separate certain contaminants from water at the point of use. Some reverse osmosis products carry independent microplastic-reduction certifications, although performance must be confirmed for the individual model.

East Coast Water Quality provides reverse osmosis drinking-water systems, whole-home conditioners and free home water testing for households in Virginia and North Carolina. Its reverse osmosis systems are designed for drinking water, while its whole-home conditioners primarily address issues such as chlorine and mineral hardness.

A water conditioner should not automatically be treated as a microplastic filter. The system’s specifications, certifications and intended contaminant-reduction claims remain the deciding factors.

What is the central lesson from the microplastics and heart attacks study?

The study found a clear pattern: microplastics and nanoplastics appeared more frequently, at higher concentrations and in more forms among patients experiencing severe heart attacks.

The pattern matters because it adds to evidence connecting environmental exposure, inflammation and cardiovascular disease.

Yet the boundary remains firm. The study does not prove that microplastics cause heart attacks. It identifies a warning signal that requires larger studies, stronger exposure data and long-term observation.

Source: Fox News