Most of us don’t spend much time thinking about plastic.
We recycle it. We drink from it. We store leftovers in it. It’s become such a normal part of everyday life that we rarely stop to think about where it ends up—or whether it could affect our health.
That changed when researchers published a study in the New England Journal of Medicine examining plaque removed from patients with carotid artery disease. They found microscopic plastic particles within many of these plaques, and patients whose plaques contained these particles experienced more heart attacks, strokes, and deaths during follow-up than those whose plaques did not. It was a striking finding that quickly made headlines around the world.
As a preventive cardiologist, I found the study fascinating.
But I also think it’s important to understand what the study actually showed…and what it didn’t.
What Did the Researchers Find?
The study involved patients undergoing carotid endarterectomy, a surgery performed to remove plaque from severely narrowed carotid arteries. After the plaque was removed, researchers analyzed it for the presence of microplastics and nanoplastics.
They detected microscopic plastic particles in many of the samples, most commonly polyethylene (used in products like plastic bags and bottles) and polyvinyl chloride (PVC). Patients whose plaques contained these particles experienced significantly more cardiovascular events—including heart attacks, strokes, and death—during follow-up than patients whose plaques did not.
It’s easy to see why this study attracted so much attention.
But it’s equally important not to overinterpret what the researchers found.
Association Is Not the Same as Causation
One of the most important concepts in medicine is that association does not necessarily mean causation.
This study demonstrated that patients with detectable microplastics in their arterial plaque had worse cardiovascular outcomes. It did not prove that the plastics caused those outcomes.
That’s a critical distinction.
Think about firefighters at a house fire. Firefighters are almost always present at large fires, but they didn’t cause the fire. They’re there because of it.
The same question applies here.
Are microplastics actively contributing to plaque formation, inflammation, and cardiovascular disease? Or are they simply accumulating in arteries that are already diseased?
At this point, we don’t know.
The study raises an important question. It doesn’t provide the final answer.
Why This Matters
Although this study doesn’t prove cause and effect, I don’t think it’s something we should dismiss.
Researchers have already detected microplastics in human blood, the placenta, lung tissue, the brain, and other organs. Finding them within atherosclerotic plaque adds another piece to a growing body of research suggesting that our environment may influence health in ways we’re only beginning to understand.
Laboratory studies suggest microplastics may contribute to inflammation, oxidative stress, endothelial dysfunction, and immune activation—all processes involved in the development of atherosclerosis. Whether those mechanisms explain what was observed in humans remains uncertain, and much more research is needed.
This is how science often progresses. One study raises an important question. Additional studies determine whether the findings are reproducible, biologically meaningful, and ultimately change how we practice medicine.
Does This Change What I Recommend to My Patients?
In many ways, it reinforces what I’m already discussing in my practice.
While this study doesn’t prove that microplastics cause heart attacks, it adds to a growing body of research suggesting that our environment may influence our long-term health. That’s one of the reasons I routinely talk with my patients about reducing unnecessary environmental toxin exposure whenever it’s practical to do so.
Plastics are one example.
We also know that some plastics contain chemicals such as bisphenol A (BPA), an endocrine disruptor that can interfere with normal hormone signaling. While BPA is different from the microplastics studied in this research, both serve as reminders that the products we use every day may have biologic effects beyond what we once appreciated.
Fortunately, reducing exposure doesn’t have to be complicated.
I encourage patients to avoid heating food in plastic containers, choose glass or stainless steel whenever practical for hot foods and beverages, and minimize heavily processed foods when possible.
One hidden source of BPA that surprises many people is thermal paper receipts. The shiny coating used on many receipts may contain BPA or related chemicals that can transfer to your skin, particularly with frequent handling. Whenever possible, I recommend declining paper receipts or requesting an electronic receipt instead.
At the same time, it’s important to keep these findings in perspective.
Environmental exposures are one piece of the puzzle, but they’re not a substitute for addressing the cardiovascular risk factors we know have the greatest impact. Optimizing blood pressure, ApoB, blood sugar, body composition, nutrition, exercise, and sleep remains the foundation of heart disease prevention.
I don’t view these as competing priorities.
The best preventive medicine addresses both—focusing on the lifestyle factors we know improve health while also making thoughtful, practical choices to reduce unnecessary environmental exposures.
The Bottom Line
One of the things I enjoy most about preventive cardiology is that the science is always evolving.
Some studies completely change the way we practice. Others ask important questions that take years to answer.
I believe this study falls into the second category.
It’s intriguing.
It’s biologically plausible.
And it deserves further investigation.
But it’s not evidence that plastics are causing heart attacks, nor is it a reason to become fearful of everyday life.
Instead, I see it as another reminder that our environment matters, that there is still much we have to learn, and that good medicine requires both curiosity and perspective.
As more research emerges, I’ll continue to follow it closely. In the meantime, my advice remains the same: focus on the lifestyle habits and cardiovascular risk factors we know have the greatest impact on long-term health while making reasonable, sustainable choices to reduce unnecessary environmental toxin exposure wherever you can.
If you’re interested in understanding your cardiovascular risk or building a personalized prevention plan, we’d be happy to help. At Nova Wellness, we believe the best prevention combines the latest scientific evidence with practical, individualized strategies that support lifelong health.
This article is for educational purposes and is not a substitute for personalized medical advice.