This Probiotic From Kimchi Can Vacuum Nanoplastics Right out of Your Gut

A common kimchi microbe helps the body flush out microscopic plastic pollution.

You probably ate 100,000 plastic pieces over the past year. And some reports suggest that number was a conservative estimate. You didn’t see it on your plate or your fork, but it was there, hiding in the salt, the water, the food, and even the dust floating in our living rooms. These tiny pieces of plastic, known as nanoplastic, are smaller than a grain of sand.

Unlike larger microplastics, nanoplastics are small enough to slip through your gut lining and hitch a ride in your bloodstream. Once they’re in, they set up shop in your kidneys, your liver, and other vital organs. But researchers in South Korea just found an unlikely ally in the fight against this invisible invasion: a humble bacterium living in a jar of fermented kimchi.

The Invader and the Fermentation

Kimchi is a microbial wonderland. It’s home to hundreds of strains of lactic acid bacteria. These microbes are the good guys that help our digestion and boost our immunity. The team screened several of these strains to see if any of them had a natural “stickiness” for plastic. They found their champion in CBA3656.

The new study, from the World Institute of Kimchi, studied how this particular strain interacts with plastic in the gut. This bacterium has shown promise in clearing contaminants and researchers wanted to see if it works with plastic as well.

The bacterium doesn’t eat the plastic. Rather, it carries it through a process called bioabsorption. The bacteria’s cell walls are covered in chemical “hooks” that act like microscopic Velcro, dredging the nanoplastics as they pass by.

In the lab, the performance of CBA3656 was stunning. The team tested the bacteria across a gauntlet of harsh conditions, dropping them in solutions with different plastic concentrations, shifting the temperature from near-freezing to a hot-tub-level 131°F (55°C), and changing the pH from highly acidic to basic. Through it all, CBA3656 kept working. At its peak, it achieved an 87% efficiency rate in grabbing plastics.

But, of course, a real gut is very different from a Petri dish.

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Mice and Plastic

The next step was to simulate the environment of the human intestine in a dark, acidic, churning tube of fluids. Here too, CBA3656 outperformed its cousins. While other strains of Leuconostoc struggled, CBA3656 maintained a 57% adsorption rate. Then, they moved on to mice.

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These were specialized laboratory mice with no natural gut bacteria, providing a blank slate for the experiment. They fed the mice nanoplastics made of polystyrene, a common plastic used in everything from food packaging to insulation. Half the mice got a dose of CBA3656; the other half did not.

The results were clear: the mice that took the probiotic excreted more than double the amount of plastic in their feces compared to the control group. The bacteria were literally binding to the plastic in the gut and escorting it out of the body.

By increasing the fecal excretion of these pollutants, the bacteria reduced the amount of time the plastic spent in the body, significantly lowering the risk that those particles would migrate into the bloodstream.

This Is Still Early Days

Before you start munching on kimchi every day, there are still caveats.

It’s always worth taking these “superfood” breakthroughs with a grain of (fermentation) salt. This study comes directly from the World Institute of Kimchi, a South Korean government-funded body with a clear mandate to promote and protect the country’s most famous export. While the peer-reviewed data is likely accurate, the institute has a natural incentive to find wins that boost the cultural and economic value of kimchi.

The researchers also point out that a germ-free mouse isn’t a human. Our guts are packed with trillions of other microbes, all competing for space and resources. We need more studies to see if CBA3656 can maintain its plastic-grabbing powers when it’s surrounded by the jungle of the human microbiome.

Still, the implications are massive. We are looking at a future where probiotics can become functional food designed to mitigate the specific environmental toxins of the 21st century. Imagine a yogurt or a supplement specifically formulated for people living in highly polluted areas, or for those who consume high amounts of seafood (a major source of nanoplastics).

This research also highlights the untapped value of traditional fermented foods. For centuries, humans have used fermentation to preserve food and improve health, often without knowing the complex chemistry behind it. Now, as we face a crisis of our own making — the saturation of our environment with synthetic polymers — it turns out that our ancestors’ recipes might hold the key to our survival.

The study was published in Bioresource Technology.