Do microplastics in the gut affect the immune system?

What's actually in it

Microplastics are tiny plastic particles that end up in our bodies through the water we drink and the food we eat. Research shows these particles are now present in our drinking water supply systems and can even hack our water safety. Once ingested, these plastics don't just pass through. They interact with your gut, your liver, and your brain.

What the research says

A 2026 study in FASEB J found that polystyrene microplastics disrupt the natural transfer of healthy bacteria through breast milk. This process is vital for early-life gut health and the proper development of the immune system in offspring.

The damage goes beyond the immune system. A 2026 study in Toxics highlights how microplastics influence the gut-liver axis and change how your body regulates macrophages, which are key cells in your immune response. This link is also being studied for its potential connection to diabetes.

Furthermore, a 2026 study in J Agric Food Chem shows that these plastics disrupt the gut-brain axis. By activating specific pathways in the brain, they can impair the connections between your nerve cells. This confirms that microplastics are not just physical debris: they are active agents that interfere with your body's most critical systems.