Can styrene migrate from polystyrene food containers into your meals?

What's actually in it

Polystyrene is the foam plastic used for takeout containers, disposable cups, egg cartons, and deli trays. It's made from the chemical styrene, which can leach back out of the container into your food. Styrene is classified as a possible human carcinogen by health agencies.

What the research says

A 2026 study in Food Chem measured styrene migration from food contact materials under different conditions. The researchers confirmed that styrene moves from polystyrene containers into food. Hot, fatty, and acidic foods pulled out the most styrene. Even at room temperature, measurable amounts transferred over time.

Fatty foods like cheese, meat, and oily dishes absorbed the most styrene because the chemical dissolves easily in fat. Heating food in polystyrene containers, such as microwaving a foam box, sped up migration sharply.

Never microwave food in polystyrene (foam) containers. Transfer takeout to a plate or glass dish before reheating. For daily food storage, choose glass, stainless steel, or ceramic containers.