Fermented Clean-up Crew Clears Microplastics. Thanks, Kimchi.

Nanoplastics are in your food, your water and, by now, probably your body. They're small enough to slip through the intestinal wall and lodge in organs including the kidneys and brain. Researchers are still looking for biological ways to intercept them before that happens.

One promising lead just came out of a jar of kimchi.

Scientists at South Korea's World Institute of Kimchi isolated a lactic acid bacterium called Leuconostoc mesenteroides CBA3656 from fermented kimchi and tested how well it could bind to nanoplastic particles. Under standard lab conditions, it performed about the same as a reference probiotic strain: 87 percent binding efficiency versus 85 percent. Not a dramatic difference.

Then the researchers switched to conditions designed to mimic the human intestine. The reference strain collapsed, dropping from 85 percent to just 3 percent. The kimchi strain held at 57 percent, still clinging to the plastic particles even in the acid, enzyme and pressure environment of a gut in action.

In a mouse study, animals that received the kimchi probiotic excreted more than double the nanoplastics in their feces compared with mice that didn't. The bacteria appeared to be grabbing the particles and escorting them out.

The study was done in mice and only with polystyrene nanoplastics, so the human translation is not yet confirmed. The mechanism behind the kimchi strain's unusual gut-resilience is also not fully understood. But the basic finding stands: something in kimchi can hold onto plastic in conditions where most microbes let go.

Your gut's cleanup crew just got a new member. It's been sitting in the back of Korean refrigerators for centuries.

Read the full story at ScienceDaily, May 18, 2026

Hot Take: Pass the kimchi. Your gut apparently has community service hours to fill, and this bacterium showed up with a trash bag.