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Origin, environmental presence and health effects of microplastics
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This review synthesizes current knowledge on the origins, environmental distribution, and health effects of microplastics, covering exposure pathways (ingestion, inhalation, dermal contact) and associated health risks including oxidative stress, inflammation, metabolic disruption, neurotoxicity, reproductive toxicity, and potential carcinogenicity.
Microplastics (MPs) – consisting of small plastic particles with size less than 5 mm – have become ubiquitous environmental contaminants. Even though plastics are mass produced and proved to be useful in many applications, they may have potentially negative impacts on environment and human health. Multiple sizes, shapes, and polymer types, and their various sources can influence the environmental and human health effects of MPs. Being present in oceans, freshwater, soils and air, MPs can cause human exposure via ingestion, inhalation, and dermal contact, resulting possibly in oxidative stress, inflammation, altered balance in metabolism and immune system, neurotoxicity, reproductive toxicity, and cancer risk. Also, MPs can act as vectors of toxicants or microorganisms. All the same, public awareness towards MPs is currently low, and a lot of studies related to MPs are still ongoing. Further research is needed for a better understanding of MPs’ occurrence in environmental systems and their human health effects.
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This review synthesized evidence on microplastic exposure pathways and health effects in humans, finding that microplastics enter the body via ingestion, inhalation, and dermal contact and are associated with oxidative stress, inflammation, genotoxicity, and endocrine disruption.
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This review examines the potential health effects of human exposure to microplastics through ingestion, inhalation, and skin contact. Researchers found that microplastic exposure may cause oxidative stress, inflammation, and immune system disruption, with the body's inability to break down synthetic particles potentially leading to chronic inflammation. The study emphasizes that while evidence of harm is growing, microplastic toxicity varies greatly depending on particle properties, concentration, and individual susceptibility.
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Researchers reviewed human exposure routes to micro- and nanoplastics — via air, water, and food — and summarized reported toxicological outcomes, identifying ingestion and inhalation as primary entry points and flagging oxidative stress, inflammation, and endocrine disruption as key health concerns warranting further study.
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