Patients suffering severe heart attacks are significantly more likely to have tiny plastic particles circulating in their blood than people with stable heart disease or healthy arteries, according to a new study raising fresh concerns about the potential health effects of microplastic pollution.
The findings, published in the European Heart Journal, examined blood samples from the coronary arteries of 61 patients undergoing angiograms, a medical procedure used to identify narrowed or blocked blood vessels supplying the heart.
Researchers found that nearly 84 per cent of patients experiencing an acute heart attack had detectable levels of microplastics and nanoplastics in their blood. By comparison, plastic particles were found in only 40 per cent of patients with stable coronary artery disease and 32 per cent of people with healthy coronary arteries.
Microplastics are tiny pieces of plastic measuring less than five millimetres, while nanoplastics are even smaller and invisible to the naked eye. They are created when larger plastic items such as bottles, food packaging, and shopping bags break down over time. People can be exposed to these particles through food, drinking water, and the air they breathe.
The researchers also found that polyethene, one of the world’s most widely used plastics, was present in 97 per cent of patients who tested positive for plastic particles. Polyethene is commonly used in plastic bags, food containers, and bottles.
The findings add to a growing body of evidence suggesting that microplastics may play a role in cardiovascular disease. However, the researchers cautioned that the study does not prove plastic particles directly cause heart attacks.
"This study adds to emerging research showing the potential role of micro‑ and nanoplastics in heart disease," experts noted, while emphasising that the findings should be interpreted carefully.
Because the research was observational, it could only identify an association between plastic particles and heart attacks rather than establish a direct cause‑and‑effect relationship.
The researchers also acknowledged several limitations. The study involved only 61 patients from one country, making it difficult to determine whether the findings apply to people elsewhere.
Another important finding was that a history of smoking was the strongest predictor of detectable plastic particles in the blood.
Smoking and exposure to air pollution are already well‑known risk factors for heart disease, and they are also associated with higher exposure to microplastics. This makes it difficult to determine whether plastic particles themselves increase the risk of heart attacks or whether they are simply more common among people already exposed to other harmful environmental factors.
"The findings are important, but they do not prove that plastics cause heart attacks. Larger studies involving more diverse populations will be needed to better understand whether these particles directly contribute to cardiovascular disease."
In recent years, scientists have increasingly detected microplastics throughout the human body. Previous studies have identified the particles in the lungs, liver, kidneys, blood, placenta, and even brain tissue, raising questions about their possible long‑term health effects.
Although scientists are still investigating exactly how microplastics affect the body, some studies suggest they may trigger inflammation, damage blood vessels, and increase oxidative stress, all known contributors to heart disease.
The latest study strengthens concerns that plastic pollution may have consequences extending beyond the environment and into human health.
While researchers continue investigating these links, health experts recommend taking simple steps to reduce daily exposure to plastics.
These include storing food in glass or ceramic containers instead of plastic, especially when reheating meals, as heat can increase the release of plastic particles into food.
Experts also advise limiting the use of single‑use plastic bottles and food containers, choosing reusable alternatives where possible, and avoiding heating food in plastic containers in microwaves.
Drinking filtered water, reducing the use of heavily packaged foods, and replacing worn plastic kitchen utensils with safer alternatives may also help reduce exposure over time.
Experts stress, however, that reducing microplastic exposure should not replace proven ways of protecting heart health. Maintaining a healthy diet, exercising regularly, avoiding smoking, controlling blood pressure and cholesterol, and managing diabetes remain the most effective strategies for lowering risk.
As research into microplastics continues, scientists hope larger international studies will provide clearer answers about whether these particles are merely a marker of environmental exposure or an overlooked contributor to one of the world’s leading causes of death.
Heart attacks are a growing public health concern worldwide.
According to the World Health Organisation (WHO), cardiovascular diseases killed an estimated 19.8 million people in 2022, with heart attacks and strokes accounting for 85 per cent of those deaths.
In Kenya, cardiovascular diseases cause nearly 38,000 deaths annually, account for one in four hospital admissions, and are responsible for about 13 per cent of all deaths, underscoring the growing burden of heart disease in the country.
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