Can microplastics contribute to heart disease?

What's actually in it

You swallow and inhale microplastics from food packaging, bottled water, house dust, and synthetic fabrics every day. These tiny plastic particles enter your bloodstream from your lungs and gut. Researchers have found them in human blood, arteries, and even in the plaques that clog blood vessels. The chemicals embedded in the plastic, like BPA, phthalates, and heavy metals, come along for the ride.

What the research says

A 2026 narrative review in Hellenic J Cardiol pulled together the emerging evidence linking microplastic exposure to cardiovascular disease. The review looked at both human data and lab studies to map out the potential pathways from plastic particle to heart attack.

The evidence points to chronic inflammation as the main mechanism. When microplastics lodge in blood vessel walls, they trigger an immune response. White blood cells try to engulf the particles, release inflammatory chemicals, and damage the vessel lining in the process. This is the same type of inflammation that drives atherosclerosis, the buildup of plaque in arteries.

Lab studies showed that microplastics also cause oxidative stress in heart cells, damage the endothelium (the inner lining of blood vessels), and can disrupt heart rhythm. The chemicals leaching off the plastic particles add to the damage.

The review concluded that while more human studies are needed, the biological evidence is strong enough to raise real concern. Microplastics are in your blood right now, and they appear to be doing things that increase your risk of heart disease over time.