Can biodegradable microplastics from food containers affect metabolism and gut bacteria?
Some concern. A 2025 mouse study found PLA and PE microplastics from food containers changed metabolism and gut bacteria. It is animal evidence, not human proof.
What's actually in it
PLA is a common biodegradable plastic used in some food containers. PE is a common conventional plastic. Both can shed tiny plastic pieces from food-contact items.
What the research says
A 2025 J Hazard Mater study exposed mice for 4 weeks to irregular PE microplastics and PLA microplastics released from food containers. Both types changed glycerophospholipid metabolism and gut bacteria. PLA caused stronger lipid-metabolism changes than PE in this mouse study.
The researchers also found liver and intestinal tissue changes in mice after exposure to both plastic types. PLA caused more serious tissue damage than PE in their experiment.
This does not prove the same effect happens in people using one takeout bowl. It does show that biodegradable plastic is not automatically a better food-contact choice for the body.
What you can do
Use glass storage for leftovers and reheating. If you use PLA or other biodegradable containers, keep them for cooler, short-term use. Heat and long storage are good places to choose glass instead.
The research at a glance
What to use instead
Use glass storage for leftovers and reheating when you want a simple swap away from plastic food contact.
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