The Discovery of and Health Effects of Microplastics in Food, Water, and Clothes

Since World War II, over 8.3 billion metric tons of plastic have been generated, with annual production increasing from 2 million tons in 1950 to 450 million in 2023 (Ritchie et al., 2023). Microplastics—plastic particles smaller than 5 millimeters—account for 92% of pollution, making them one of the most persistent forms of environmental contamination worldwide. Because these particles contaminate food, water, and clothes, microplastics have emerged as a global health and environmental threat. This threat requires the combination of improving pre-existing systems, technological innovation and collective action to reduce their long-term impacts.

Recently, microplastics have been detected in food, potable drinking water, and even clothing. While plastic pollution in the ocean dominates public attention, an equally concerning amount of plastic is deposited on land. An estimated 107,000 to 730,000 tons of microplastics, mainly from sewage sludge, were found in agricultural soil in the United States and Europe (n.d.,Microplastics Feared To Be Permeating Agricultural Land). Sewage sludge is the solid byproduct of wastewater, where microplastics remain after filtration and are repurposed for fertilizers. Once in the soil, microplastics are absorbed by plants along with nutrients. Studies have identified plastics in the roots and leaves of greens that end up in food.

Aside from food and drinking water, clothing is another exposure to microplastics. Synthetic fabrics such as polyester, nylon, and acrylic shed microscopic fibers when washed, as well as during regular wear. These fibers become airborne, leading to inhalation of plastics in everyday environments. At the same time, fibers enter bodies of water such as oceans or rivers, and when consumed by organisms, enter the food chain. In addition, microplastics have also been detected in bottled and tap water. These particles primarily originate from wastewater effluent. Contaminated water first enters a treatment plant, where large solids like trash and sand sink to the bottom and are removed. However, microplastics are too small and light for this removal, resulting in most of them remaining in the water even after filtration, and they enter the human body when consumed.

Scientists have found microplastics in human livers, blood, saliva, and other tissues. While the study of plastic influence on human health is rather recent, scientists, through the study of cell culture and animal models, concluded that microplastics increase cancer risks by damaging DNA and changing nucleotides in genes (Dutchen, The tiny particles are even in our bodies. What might this mean for our health?). Studies performed by lessons from the field of environmental toxicology experimented with mice that were constantly exposed to plastics and found a reduction in sperm quality and count, ovarian scarring, and metabolic disorders in offspring (Dutchen,The tiny particles are even in our bodies. What might this mean for our health?).

This research suggests that, in addition to affecting human reproductive systems, microplastics pose greater risks as genetic disease. Beyond human health, microplastics disrupt ecosystems. Plastic pollution has affected over 2100 marine species, with about 1300 documented species having ingested microplastics (Tired Earth Editorial Board, 2024). As organisms mistake plastic particles as food, they suffer from internal injury, malnutrition, and even death. As the population of smaller organisms declines, it diminishes a critical food source for higher trophic levels, and disrupts the entire ecosystem and food chain. Additionally, microplastics interfere with oceanic carbon cycles. In healthy marine life, tiny organisms like zooplankton absorb carbon dioxide (CO₂) from the atmosphere through photosynthesis, and transfer it to the deep ocean when they die or produce waste. As the number of these organisms decreases, less carbon dioxide is removed. In this system, microplastics weaken the carbon storage system and indirectly contribute to climate change.

There are numerous approaches to reduce microplastic pollution, but the most immediate solution is upgrading pre-existing infrastructures. For instance, advanced water filtrations are able to remove over 90% of microplastics from the liquid waste that flows out of a sewage treatment plant (Puteri et al.,2024). If expanding the use of these technologies, a portion of the microplastics is expected to be removed from drinking water. However, this solution is incomplete. Due to the sheer volume of plastic and the persistence of particles smaller than microplastics —known as nanoplastics— many contaminants will evade the filter and still enter the human body.

The developments of new clean-up technologies also offer possible solutions. Researchers at Sichuan University recently introduced “robo-fish,” a self-propelled technology that cleans water surfaces through strong chemical and electrostatic interactions (n.d.,Scientists unveil bionic robo-fish to remove microplastics from seas). By latching themselves onto microplastics contaminated with dyes, antibiotics, and heavy metals, they effectively remove particles from shallow water (n.d.,Scientists unveil bionic robo-fish to remove microplastics from seas).

Another design involves microbes. Microbes are a group of living organisms that are small in size and can only be observed under microscopes. It first attach to the plastic and form sticky substances called biofilms; then, the microbes within the biofilm release enzymes that break the plastic down into smaller molecules; finally, these harmful products are converted into carbon dioxide and water, which are released into the environment. However, concerns still challenge the wider use of these technologies. For example, the degradation process for microbes is too slow to keep up with the large amount of plastic being produced and discarded every day.

These challenges demonstrate that microbes and other technologies alone are not the solution to the plastic crisis. A lasting change will only happen through a collective commitment to create a more sustainable and cleaner future for all. Even small acts of selecting products manufactured with bio-based or biodegradable plastics, recycling plastics,builds towards a healthier future.

Microplastics have become embedded in nearly every part of modern life, from the food people consume, the clothes they wear, and even the water they drink. Although invisible to the naked eye, they have detrimental effects on human health and the ecosystems worldwide. While new technologies and developments offer promising solutions to reduce contamination, innovation alone will not solve the crisis. Lasting progress and a cleaner, safer world for future generations can only be achieved when governments, industries, and individuals work together to reduce plastic waste at its source and limit the spread of microplastics.
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References

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