Can polystyrene microplastics from takeout containers damage your heart and lungs?

What's actually in it

Polystyrene is used in takeout cups, styrofoam food containers, disposable plates, and some food packaging. It sheds microplastics into hot foods and drinks. Inhaling polystyrene particles from indoor air is another exposure route, since synthetic materials in homes release airborne microplastics.

Once these particles enter your body through ingestion or inhalation, they travel in the bloodstream and accumulate in organs.

What the research says

A 2026 study in Particle and Fibre Toxicology found that polystyrene microplastics caused measurable changes in cardiac and pulmonary physiology and microenvironment. In both organs, the particles triggered local inflammation, altered the tissue microenvironment around cells, and impaired the normal function of both the heart and lungs.

The cardiac effects included changes to heart rhythm parameters and inflammatory infiltration of cardiac tissue. The lung effects included impaired gas exchange and inflammatory cell accumulation. Both organs showed dose-dependent responses: more particles, more damage.

Hot food and drinks accelerate polystyrene shedding. A hot coffee or soup in a polystyrene cup has measurably higher microplastic content than cold food in the same container. Switching to glass, ceramic, or stainless steel for hot beverages is one of the most direct ways to reduce this exposure.