Can polystyrene microplastics disrupt immune cleanup?
Use caution with frequent polystyrene foam contact. A 2026 Immunity study found polystyrene microplastics disrupted efferocytosis, the process cells use to clear dying cells, in lab models and exposed animals.
What is actually in it
Polystyrene is a plastic used in some foam cups, foam food containers, trays, and packaging. When plastic breaks down, it can form tiny particles called microplastics.
Your immune system has cleanup cells called macrophages. One job they do is clearing dying cells. That cleanup process is called efferocytosis.
What the research says
A 2026 Immunity study found that polystyrene microplastics disrupted efferocytosis in macrophages and Sertoli cells in lab tests. In exposed animals, the study found suppressed efferocytosis and damage in the lungs, liver, and testes.
The study also found that polystyrene microplastics interfered with cell digestion pathways. This is strong hazard evidence, but it is not a direct measurement of risk from one meal container.
What to do at home
Use glass, stainless steel, ceramic, or wood where it fits the job. Move hot food out of foam or thin plastic containers when practical.
Do not reheat food in foam packaging. Replace worn plastic storage items that are scratched, sticky, or shedding.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Polystyrene microplastic-induced pathophysiology is driven by disruption of efferocytosis. | Immunity | 2026 |