Are children's lunchboxes made of plastic safe for hot food?

What's actually in it

Plastic containers are not stable when they get hot. When you put warm or hot food into a plastic lunchbox, chemicals can move from the container into the food. This process is called migration. It means your child is likely eating tiny amounts of plastic and chemical additives every time they use a plastic container for a hot meal.

These materials are not just sitting there. They are active, and heat makes them release substances that were never meant to be in your food. Once these chemicals get into the food, they go straight into the body.

What the research says

A 2026 study in Food Chem confirms that chemicals move from plastic food containers into food after cooking or heating. This peer-reviewed research shows that plastic is not a safe choice for hot food because it sheds substances during the heating process.

Other research highlights the broader risks of plastic materials in our food chain. A 2026 study in J Hazard Mater looked at the substances that move from plastic food contact materials. The science shows that these materials are complex and can release various compounds that pose potential health risks.

Furthermore, plastic is a known carrier for other harmful things. A 2026 study in J Hazard Mater explains how microplastics act as vectors for heavy metals and other chemicals. When you use plastic for hot food, you are increasing the chance that these contaminants end up in your child's lunch.