What unknown chemicals leak from plastic and paper food packaging?

What's actually in it

Every food package is made with a mix of chemicals: polymers, adhesives, inks, coatings, and additives. Regulators test for the ones they know about. But modern packaging contains many chemicals that nobody is actively looking for. These unnamed compounds can still migrate into your food, especially with heat, moisture, or long storage times.

Both plastic and paper packaging are culprits. Paper containers often have plastic or wax coatings that can be just as chemically complex as a plastic bag.

What the research says

A 2026 study in Food Chem used a technique called non-target screening to hunt for chemicals in food packaging that standard tests wouldn't catch. Instead of checking for a list of known bad actors, the researchers scanned for everything they could find.

They tested both plastic and paper food containers and found dozens of previously unidentified chemicals migrating out of the materials. Many of these compounds had never been tested for safety because nobody knew they were there.

The researchers then ran these mystery chemicals through computer toxicity models to predict how harmful they might be. Several scored high for potential endocrine disruption, liver damage, and developmental toxicity. These aren't confirmed dangers yet, but they're red flags that deserve follow-up.

The take-home point is that "food-safe" labels only cover known chemicals. Your food packaging might pass every current test while still leaching compounds nobody has evaluated. Using glass, stainless steel, or ceramic containers for food storage avoids this blind spot.