Can microplastic exposure affect gut bacteria?

What is actually in it

Microplastics are tiny plastic pieces smaller than 5 millimeters. People can swallow them from drinking water, disposable plastic tableware, food packaging, and dust that settles on food.

Your gut microbiome helps digest food, protect the gut lining, and make short-chain fatty acids. Because microplastics pass through the gut, researchers are studying whether they can shift this bacterial balance.

What the research says

A 2026 Gut Microbes review found that human evidence is still limited, but several cross-sectional studies have looked at microplastic exposure and gut microbiome changes in infants, preschool children, and adults.

The review reported higher abundance of some bacterial groups, including Enterobacteriaceae and Moraxellaceae, after microplastic exposure. It also reported lower abundance of several groups linked with short-chain fatty acid production, including Roseburia and Coprococcus.

The review also noted lower butyrate production and lower short-chain fatty acid levels. These findings matter because short-chain fatty acids help feed and protect the gut lining.

This does not prove that one plastic bottle or one takeout meal changes your gut. It does support reducing repeat plastic contact with food and drinks where easy swaps exist.

What to do next

Use glass for leftovers, hot food, oily food, and acidic foods. Do not microwave plastic. Replace scratched plastic containers first. These steps lower plastic contact without making food feel complicated.