Plastic has become embedded in daily life, used in everything from food packaging and beverage bottles to apparel, household items, and automobiles. As these products degrade over time, they release minuscule fragments into the environment. These particles are known as microplastics, with even tinier nanoplastics often present. Their microscopic size allows people to breathe them in or ingest them unknowingly.
Recent studies have detected microplastics in drinking water, seafood, fruits, vegetables, household dust, and even within the human body. Over the past few years, scientists have identified these particles in blood, lung tissue, the placenta, breast milk, and other organs. This widespread presence has raised concerns about the long-term health impacts of exposure to these tiny pollutants. A particular area of focus is heart disease, which remains the leading cause of death worldwide.
A study conducted by researchers at Sapienza University of Rome, in collaboration with the University of Verona and the University of Campania “Luigi Vanvitelli,” revealed that individuals who experienced major heart attacks were significantly more likely to have microplastics and nanoplastics in their bloodstream compared to those with less severe heart conditions or healthy coronary arteries. The findings were published in the European Heart Journal.
The study involved 61 patients undergoing tests for suspected coronary artery disease. Some had suffered an acute heart attack, others had chronic ischemic heart disease, and a few were found to have normal coronary arteries. Blood samples were taken from arteries supplying blood directly to the heart as well as from other body areas. The researchers also collected data on participants’ smoking habits and their long-term exposure to fine air pollution.
Laboratory tests confirmed that tiny plastic particles were prevalent, but their distribution varied among the groups. Among those who had experienced a heart attack, 84% had detectable plastic particles in their coronary blood. In contrast, only 40% of individuals with chronic heart disease and 32% of those with normal arteries showed the presence of plastics. Those in the heart attack group also carried a broader variety of plastic types, with polyethylene—the plastic commonly found in grocery bags and containers—being the most common.
The study also pointed to environmental exposure as a potential factor. Smokers were about six times more likely to have plastics in their blood than nonsmokers. Additionally, participants exposed to higher levels of PM2.5 air pollution presented increased plastic particle levels. Every individual who both smoked and faced elevated air pollution levels tested positive for plastics, whereas only a small percentage of those lacking these exposures had detectable particles.
Scientists suggest that cigarette smoke and polluted air may carry tiny plastic particles deep into the lungs, from where they can cross into the bloodstream. Once circulating, these particles might trigger inflammation, cause damage to blood vessel linings, and increase oxidative stress—all biological processes associated with the development of heart disease.
However, the researchers emphasize that the study demonstrates a correlation, not a direct cause-and-effect relationship. Other factors could also play a role, and the relatively small sample size indicates a need for larger, more diverse studies to verify these findings.
Experts who reviewed the study in an accompanying editorial noted that these findings align with an expanding body of evidence. Previous research has found microplastics within arterial plaques, which are linked to higher risks of heart attacks, strokes, and mortality. Laboratory tests have also shown that plastic particles can provoke inflammatory responses capable of damaging blood vessels.
The researchers believe their findings should prompt further investigation into plastic pollution as a potential cardiovascular risk factor. While traditional factors like smoking, high cholesterol, diabetes, obesity, and hypertension remain the predominant causes of heart disease, environmental contaminants may be an additional piece of the puzzle. Efforts to reduce tobacco use, improve air quality, and limit plastic waste could generate health benefits that extend beyond environmental preservation.
For those interested in heart health, exploring studies on how dietary changes like eating eggs might reduce heart disease risk or how certain herbal supplements could affect heart rhythm is recommended. Other recent findings suggest that olive oil may promote longevity, and vitamin D could help lower autoimmune disease risks.
Source: Sapienza University of Rome.