Mice that eat mealworms contaminated with PVC microplastics develop permanent anxiety and hyperactive brain behavior.
April 23, 2026
Original Paper
INGESTION OF Tenebrio molitor LARVAE CONTAMINATED WITH POLYVINYL CHLORIDE MICROPLASTICS RECONFIGURES SYSTEMIC PHYSIOLOGY IN MALE C57BL/6J MICE
SSRN · 6620129
The Takeaway
Plastic particles travel through the food chain from insects to predators and eventually cross into the brain. Once there, they disrupt the balance of neurochemicals like dopamine and acetylcholine. These mice become significantly more restless and exhibit fearful behaviors compared to those on a clean diet. This study proves that the physical and mental health of a predator is directly tied to the plastic pollution in its prey's environment.
From the abstract
The increasing ubiquity of microplastics (MPs) in the environment has intensified concern about ecologically realistic exposure pathways, particularly those mediated by trophic interactions, which remain poorly investigated in terrestrial systems involving mammals. We evaluated whether ingestion of Tenebrio molitor larvae previously exposed to polyvinyl chloride microplastics (PVC-MPs) could induce systemic physiological alterations in male C57BL/6J mice. Larvae were exposed to PVC-MPs and subse