The cutting board is the kitchen tool where the knife blade and ingredients come into contact most frequently. If managed improperly, it can become a waypoint for foodborne bacteria and microplastics, making material selection and hygiene management not merely a lifestyle habit but a matter of food safety.
According to the medical community on the 31st, Dr. Wade Syers, a food safety specialist at Michigan State University, said in a recent interview with foreign media that "wood and plastic differ fundamentally in how microorganisms reside and how they respond to washing."
Wooden cutting boards are often a source of concern over bacterial contamination because of their porous structure that absorbs moisture, but research findings point in a somewhat different direction. Bacteria that enter the interior of the wood die off naturally during the moisture evaporation process, and the wood's natural antibacterial components further inhibit their growth.
In addition, wood does not generate microplastics from cutting, allowing it to fundamentally avoid the key drawback of plastic cutting boards. However, it is vulnerable to the high temperatures of a dishwasher and can warp or crack, so it must be washed by hand. Immediately after handling raw meat, spraying the board's surface with a disinfectant solution diluted at a ratio of 2 milliliters of household bleach per liter of water is recommended. After washing, it should be stood up to dry, and if the surface becomes rough, it should be smoothed with sandpaper and then coated with food-grade mineral oil to protect the wood tissue.
The biggest problem with plastic cutting boards is the scratches created as the knife blade digs in. When moisture stagnates in these grooves, bacteria reside there for long periods. High-temperature sterilization in a dishwasher can address this to some extent, but the problem of microplastic exposure cannot be resolved through washing.
According to a study published in 2023 in Environmental Science & Technology, a journal of the American Chemical Society, regular use of polyethylene (PE) cutting boards can expose users to 14.5 million to 71.9 million microplastic particles annually, while polypropylene (PP) material was higher at 79.4 million.
The amount of microplastics released by PP boards was up to 60 percent higher than PE by mass and up to 71 percent higher by number. Many of the hard, sturdy-looking cutting boards distributed on the market are made of PP material, so consumer caution is needed. The possibility that microplastics disrupt the gut microbial ecosystem has been observed at the level of animal experiments, and a causal relationship in humans has not yet been established. However, boards where scratches have deepened and contaminants have begun to accumulate between the grooves should be considered for replacement.
Distinguishing uses by material is also essential. For ingredients with a high risk of cross-contamination, such as raw meat and fish, a plastic cutting board that is easy to sterilize at high temperatures should be assigned, while for vegetables, fruits, and finished dishes eaten directly, a wooden cutting board that does not generate microplastics should be assigned. This is a practical method that satisfies both hygiene and safety at the same time.
Glass, stainless steel, and marble cutting boards pose no concern over either bacteria or microplastics, but they wear down knife blades quickly, increasing the cost of maintaining cooking tools. Whatever material is used, the basic principles of cutting board hygiene are to strictly separate boards for meat and vegetables and to replace them immediately when surface damage becomes severe.
