Can PET plastic food containers cause fatty liver disease over time?

What's actually in it

PET (polyethylene terephthalate) is the clear plastic used in most water bottles, takeout containers, salad boxes, and berry clamshells. It's labeled with the recycling number #1. When these containers get scratched, heated, or reused, they shed tiny plastic particles into your food and drinks.

PET is considered one of the "safer" plastics, and it's everywhere. But being common doesn't mean it's harmless when tiny pieces of it end up inside your body day after day.

What the research says

A 2026 study in Adv Sci exposed lab animals to PET microplastics over a long period to mimic how people absorb small amounts every day. The results were clear: chronic PET exposure messed up the connection between the gut and liver, a system called the gut-liver axis.

The microplastics changed the mix of gut bacteria, which then sent harmful signals to the liver. This led to hepatic steatosis, the medical term for fatty liver. Fat started piling up in liver cells that were otherwise healthy before the exposure.

What made this study stand out was the dose. The researchers used amounts meant to reflect real-world human intake, not extreme lab quantities. That makes the findings more relevant to people who eat from PET containers every day.

You don't need to toss every plastic container you own. But switching to glass or stainless steel for foods you heat up or store for a long time can cut down on how many PET particles end up in your meals.