Do plastic food containers leach microplastics into your food?
Yes. Studies show plastic food containers, feeding bottles, and coated cups can release microplastics and nanoplastics, especially with hot water.
What's actually in it
Plastic food containers are often made from polypropylene, polyethylene, polystyrene, or coated paper. These materials can shed microplastics and nanoplastics during normal use.
Heat is the big problem. Hot water, hot food, dishwashers, and microwaves can make plastic release more particles.
What the research says
A 2025 study in Food Chemistry tested feeding bottles, food containers, and paper cups after hot-water treatment. The items released about 10,000 microplastics and 10 million nanoplastics.
The released particles were not toxic by themselves in 6 tested cell types. But they increased the toxicity of disinfection by-products, a type of drinking-water contaminant, in human cell tests. The study found the highest joint effect in HepG2 liver cells exposed to nanoplastics from feeding bottles and iodoacetamide.
A 2023 study in Science of the Total Environment also found that disposable cups released microplastics into hot water, and high temperature promoted release.
The practical step is simple: do not heat food or drinks in plastic. Move hot food into glass, ceramic, or stainless steel.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| The released micro/nano-plastics from plastic containers amplified the toxic response of disinfection by-products in human cells. | Food Chem | 2025 |
| Release of microplastics from disposable cups in daily use. | Sci Total Environ | 2023 |