Swallowing Microplastics Promotes Colon Tumors in Mice
NonToxCo Research
Science & Safety Team · 4/6/2026
Mice that swallowed microplastics collected from the actual environment developed colon inflammation and tumors. Not lab-made particles. Real plastic pollution, the same mix humans ingest every day.
What Makes This Study Different
Most microplastic studies use uniform lab-made particles. This 2026 study in Environ Pollut used a human-relevant mixture of environmentally sourced microplastics. That means the researchers collected actual plastic particles from the environment and fed them to mice at doses comparable to what humans encounter.
The result: the microplastics promoted inflammation and tumorigenesis in the mouse colon. That's tumor growth, driven by plastic ingestion at realistic exposure levels.
The Inflammation-Cancer Connection
Chronic inflammation in the colon is a well-established driver of colorectal cancer. The microplastics triggered inflammatory responses in the gut lining, creating the conditions that allow tumors to form and grow.
This isn't a far-fetched scenario. Humans ingest microplastics from food packaging, bottled water, seafood, and even table salt. Estimates suggest people swallow thousands of plastic particles per week. This study shows what those particles might be doing once they arrive.
What You Can Do
Cut down on plastic in your food chain. Don't store food in plastic. Avoid bottled water when possible. Filter your tap water. Stop microwaving in plastic containers, ever. Start making swaps with our non-toxic home essentials.
Also see non-toxic kitchen essentials for safer alternatives.