Microplastics in Blood Can Block Brain Capillaries

Microplastics circulating in the bloodstream can physically block brain capillaries. A 2025 study in Science Advances watched it happen in real time.

What Scientists Found

Using high-depth imaging, researchers tracked microplastic particles as they moved through the circulatory system. Published in Science Advances (Huang et al., 2025), the study found that microplastics in the bloodstream get picked up by cells. Those cells, carrying the plastic particles, then get stuck in the tiny capillaries of the brain cortex.

The blockages act like small blood clots. They reduce blood flow to parts of the brain. In mice, that meant neurological abnormalities and neurobehavioral changes.

How Microplastics Get Into Blood

We eat them. We breathe them. Microplastics shed from plastic food containers, cutting boards, and packaging. They pass through the gut wall into the bloodstream. From there, they travel everywhere blood goes, including the brain.

Nanoplastics, the smaller version, can also cross the blood-brain barrier directly. Once in the brain, they don't leave easily.

Switching to stainless steel, glass, and wood for food prep and storage reduces how much plastic your food contacts. That's the practical step. Browse non-toxic kitchen alternatives to start replacing the biggest sources.

Also see glass food containers for safer alternatives.

Source: Huang H et al. (2025). Microplastics in the bloodstream can induce cerebral thrombosis. Sci Adv.