Can microplastics from food packaging trigger inflammation in the brain?

What's actually in it

Nanoplastics, the smallest fraction of microplastics, are small enough to cross the blood-brain barrier. They enter the body through food, water, and inhaled particles. Once in the bloodstream, they can accumulate in brain tissue over time.

Plastic particles have now been found in human brain tissue in post-mortem studies. The biological question is what they do once they're there.

What the research says

A 2026 review on micro- and nanoplastics, neuroinflammation, and oxidative stress in the brain found that plastic particles in brain tissue trigger microglial activation (the brain's immune cells), produce oxidative stress, and promote neuroinflammation. These are the same processes involved in Alzheimer's disease, Parkinson's disease, and other neurodegenerative conditions.

The review found that the chemicals carried by microplastics, including plasticizers like phthalates and bisphenols and absorbed pesticides, add to the neurotoxic profile beyond the particles themselves.

The most direct way to reduce nanoplastic accumulation is reducing the source: filtering drinking water, avoiding plastic food containers especially for hot or acidic foods, and eating less food from plastic packaging overall.