Can tiny plastic particles affect thyroid function?
Plastic food containers can release microplastics. A 2026 mouse study found micro- and nanoplastics disrupted thyroid follicle structure and thyroid hormone measures, so glass storage is a practical swap.
What we know
A 2025 Food Chemistry study measured microplastics released from plastic food containers and found migration during food-contact testing.
A 2026 Annals of Medicine mouse study tested microplastics and nanoplastics by gavage for 4 and 8 weeks. The study found disrupted thyroid follicle structure, changed thyroid hormone measures, higher apoptosis and inflammation markers, and stronger effects from nanoplastics than microplastics.
What this means for your family
This does not prove that one food container disrupts thyroid function in people. It does show that tiny plastic particles can affect thyroid biology in animal research.
Glass containers are a low-effort way to reduce plastic particle contact with food.
Simple safer steps
Use glass for leftovers, baby food, and warm meals. Avoid microwaving food in plastic. Replace scratched plastic containers with glass over time.