Can microplastics worsen colitis and inflammatory bowel disease?

What's actually in it

Polystyrene is the plastic used in foam takeout containers, disposable cups, plastic cutlery, and some food packaging. As it breaks down, it sheds microplastic particles that you swallow with food and drinks. These particles travel through your digestive system and interact directly with your gut lining and the bacteria living there.

For the roughly 3 million Americans living with inflammatory bowel disease (IBD), anything that irritates the gut is a concern.

What the research says

A 2026 study in J Hazard Mater showed that polystyrene microplastics made colitis worse through a specific gut bacteria pathway. The key finding involves butyrate, a short-chain fatty acid produced by beneficial gut bacteria that acts as fuel for colon cells and calms inflammation.

Microplastic exposure killed off butyrate-producing bacteria, which dropped butyrate levels in the colon. Without enough butyrate, a receptor called PPARgamma stopped working properly. PPARgamma normally tells the colon to stay calm and not overreact to normal gut contents.

With PPARgamma suppressed, the colon's immune system went into overdrive. The result was more inflammation, more tissue damage, and worse colitis symptoms.

People with IBD or anyone prone to gut inflammation should be especially careful about microplastic exposure. Avoid polystyrene foam containers for food and drinks. Use glass or ceramic dishes and stainless steel water bottles. Eating fiber-rich foods can also help maintain butyrate-producing bacteria in your gut.