Microplastics and health: what we know, and what we don't

It's clear that people are exposed to microplastics. What that exposure does to human health is much less clear, and anyone claiming certainty either way is ahead of the evidence.

What we know

• Exposure is widespread. Microplastics have been found in food, drinking water, indoor air and human tissue.
• Some everyday habits increase it, such as heating food in plastic.
• Smaller particles are the bigger question. Nanoplastics are harder to measure and more likely to enter tissues.

Early warning signs

In 2024, a study in the New England Journal of Medicine found micro- and nanoplastics in the artery plaque of some patients having surgery. Those patients had a higher rate of heart attack, stroke or death over the following three years. The study shows an association, not proof that plastic caused the harm, but it's an important signal that researchers are following up.

What official bodies say

In 2019 the World Health Organization said microplastics in drinking water didn't appear to pose a health risk at the levels then known, based on limited evidence, and called for much more research. Much of that research is still under way.

How we handle this on PlasticFreeHome

We don't claim health effects the evidence doesn't show. Our Evidence Dials grade how strong the evidence is that a product exposes you to plastic, not how harmful that exposure is. Cutting avoidable exposure, especially from heat and daily contact, is a sensible precaution while the science catches up.

This guide is general information, not medical advice.