Do plastic food trays used in school lunches leach chemicals?

What's actually in it

Plastic trays are not stable containers. When they come into contact with food, they can release a variety of substances into the meal. This process is often called leaching. It happens because plastics are made with additives to provide flexibility or durability, and these chemicals are not permanently locked into the material.

Recent peer-reviewed research has identified that various substances migrate from plastic food contact materials into the food they hold. These are not just trace amounts. They are chemical compounds that end up in the food your child eats every day at school.

What the research says

The science is clear that plastic containers are a source of chemical transfer. A 2026 study in Food Chem examined the transfer of chemicals from plastic materials after cooking and found that these items are not inert. They actively release substances into the food during the heating process.

Furthermore, a 2026 study in J Hazard Mater used advanced screening methods to identify these migrating substances. The researchers found that the chemicals moving from plastic into food can be predicted to have toxic effects. This means that using plastic trays for school lunches creates a pathway for unknown and potentially harmful chemicals to enter a child's body.

While some focus is on microplastics, as seen in a 2026 study in J Food Sci, the primary concern with lunch trays is the chemical migration that occurs during regular use. These trays are often washed in high-heat industrial dishwashers and used for hot food, both of which increase the rate at which chemicals leach into the meal.