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However, Professor Min emphasized the harmful effects of microplastics on human health by generating active oxygen. Studies on animals suggest that reactive oxygen species (ROS) can lead to oxidative stress and chronic inflammation, which can be produced through various metabolic activities. It is challenging to measure the impact of microplastic-generated ROS compared to ROS produced by our cells.
Localized exposure to microplastics can have a significant impact, while slight distance from the source may reduce the effects. The level of exposure remains uncertain, as it is unclear how much microplastics an average individual ingests annually from food, water, and air. The study used fresh plastic powder, unlike the weathered particles found in the environment. Older particles with oxidized surfaces exhibited weaker signals in the tests, highlighting the inconsistent aging process of microplastics.
Microplastics are typically particles smaller than 5 millimeters, with varying minimum cutoffs. The researchers speculate that altering the particle size can influence the chemical reactions at the water interface, with nanoparticles potentially posing a greater risk due to their increased surface area. Professor Min’s team suggests that modifying the molecular structure or incorporating additives into plastics could reduce their water-repellent properties to mitigate harmful effects.
Before exploring engineering solutions, the research team aims to address unanswered questions regarding the impact of microplastics on disease and biological systems in animals and humans. Further research is needed to understand the direct link between microplastic exposure and health issues.
Source: Nature, 2026. DOI: 10.1038/s41586-026-11141-y
Source: arstechnica.com
