Can microplastics in food shift your gut bacteria?

What's actually in it

Microplastics are plastic pieces smaller than 5 millimeters. They can get into food from plastic food containers, disposable tableware, bottled drinks, cutting boards, packaging, seafood, and indoor dust.

You cannot avoid all microplastics. The practical goal is to reduce the easiest food-contact sources, especially heat plus plastic.

What the research says

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

The review reported increases in some bacterial groups, including Enterobacteriaceae and Veillonella, and decreases in others, including Lactobacillales, Roseburia, and Coprococcus. Some studies also linked exposure with lower butyrate and short-chain fatty acid levels.

The findings are not perfectly consistent. Some bacteria shifted in different directions across studies. That is why the honest takeaway is caution, not certainty.

Use glass storage for hot, oily, or acidic foods. Avoid microwaving food in plastic. Replace deeply scratched plastic cutting boards when you can. These steps will not remove all exposure, but they cut down the easiest sources.