Do cling wraps and plastic bags leach chemicals into food they touch?

What's actually in it

Polyethylene cling wraps and food storage bags are the most common way people cover and store food at home. They look simple, but they contain chemical additives: plasticizers to keep them flexible, slip agents to prevent sticking, and sometimes perfluorinated compounds for grease resistance. These chemicals aren't bonded permanently to the plastic. They migrate out, especially when they're in contact with food.

What the research says

A 2026 study in J Environ Sci Health B tested polyethylene and other plastic food packaging materials for chemical migration. The researchers measured how much phthalates, bisphenols, photoinitiators, and perfluorinated compounds transferred from the plastic into food.

All types of plastic packaging leached detectable amounts of chemicals. Fatty foods like cheese, butter, and meat pulled out the most, because the chemicals dissolve more easily into fat. Acidic foods like tomato sauce also increased migration.

Heat made everything worse. Microwaving food in plastic wrap or storing warm leftovers in plastic bags increased the transfer rate. Even at room temperature, chemicals moved into food over time. The longer your food sits in plastic, the more contaminated it gets.

The study found multiple chemicals migrating at once, creating a cocktail effect. Safety limits are set for individual chemicals, but no one tests what happens when you get a little bit of each one together.