Kimchi Bacteria and Microplastics: What Early Research Is Exploring

Microplastics are becoming an increasing area of scientific interest as researchers investigate how tiny plastic particles interact with the human body. Now, new research is examining whether certain bacteria found in fermented foods could interact with these particles inside the digestive system.

A recent study published in Bioresource Technology investigated a lactic acid bacterium isolated from kimchi and found that it was able to bind to certain microplastics under laboratory conditions. In experiments involving mice, the bacterium was also associated with increased amounts of microplastics being detected in feces. While these findings are interesting, they are still early research. The study does not establish that eating kimchi can remove microplastics from the human body.

Microplastics are extremely small plastic particles that can form as larger plastic materials gradually break down. They may enter the body through sources such as food and drinking water. Because of their small size, researchers are studying how these particles behave in the gastrointestinal tract and whether some may interact with or pass through biological barriers. Understanding what happens to these particles after they enter the body is still an emerging area of research.

The research team, led by scientists at the World Institute of Kimchi, examined a specific strain of lactic acid bacteria called Leuconostoc mesenteroides CBA3656. Rather than testing kimchi itself, researchers isolated the bacterium and investigated whether it could attach to polystyrene microplastics.

Under standard laboratory conditions, the bacterial strain demonstrated an adsorption efficiency of 87%. Researchers then tested it under simulated intestinal conditions, where the strain maintained an adsorption level of 57%. This distinction is important because the digestive system is considerably more complex than a laboratory environment. The researchers were interested in whether the bacterial strain could continue interacting with microplastics under conditions designed to resemble the intestine.

The researchers also conducted experiments using germ-free mice. Compared with mice that did not receive the probiotic strain, both male and female mice receiving L. mesenteroides CBA3656 had more than twice the amount of microplastics detected in their feces. One possible explanation is that the bacteria bound to the microplastics inside the intestine, helping move them through the digestive tract and increasing their subsequent detection in feces. However, an animal study cannot establish that the same process will occur in humans.

The study highlights an interesting area of research involving the relationship between the gut microbiome and environmental substances. Gut bacteria are already known to interact with many compounds within the digestive system. Researchers are now investigating whether certain microorganisms could also interact with environmental particles such as microplastics.

In this case, the findings suggest that a bacterium originating from a fermented food may have properties worth studying further. The researchers described the work as a potential biological approach to addressing the interaction between microorganisms and environmental micropollutants. Still, much more research is needed before these findings can be translated into practical recommendations for people.

There is currently not enough evidence to say that eating kimchi removes microplastics from the body. The study examined a particular bacterial strain that was isolated from kimchi. It did not test whether people who regularly eat kimchi have lower levels of microplastics, nor did it establish that consuming kimchi would produce the same effects observed in the experiments.

This is an important distinction when interpreting early nutrition and microbiome research. Fermented foods can be part of a varied diet, but one study involving an isolated bacterial strain should not be interpreted as proof that a particular food can “detox” the body from plastic exposure.

Research into microplastics is still developing. Scientists are continuing to investigate how these particles enter the environment, how humans may be exposed to them, and what happens after exposure. The new findings add another piece to that research by suggesting that certain food-derived bacteria may interact with microplastics in the digestive tract.

Future studies will need to determine whether these observations translate to humans and whether specific bacterial strains could have meaningful effects in real-world conditions. For now, the most appropriate takeaway is that the gut microbiome may have more interactions with environmental particles than researchers previously understood, but the potential health implications are still being investigated. For a more personalized advice, reach out to us. Our goal is to help you look better, feel better, and perform better. Get started today!