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Pathways of human exposure to microplastics, and estimation of the total burden
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Tiny plastic bits called microplastics are everywhere, in the air we breathe, the food we eat, and even things that touch our skin, and this review pulls together existing research to show we're exposed through all three routes, not just by eating contaminated food like most studies focus on. The bigger takeaway: scientists still don't have standardized, reliable ways to measure exactly how much plastic ends up in our bodies, so the true scale of our exposure remains uncertain. This matters because until better testing methods exist, it's hard to know just how much plastic we're really taking in, or what it's doing to our health.
Plastic production is continuously growing and their wastes contaminate practically all environmental niches. In the environment, large plastics undergo continuous degradation processes generating a broad amount of microplastics and nanoplastics (MNPLs) that spread through air, land, and seas. Thus, humans suffer chronic exposures to MNPLs through different pathways: ingestion, inhalation, and dermal contact. Here, we have reviewed the recently published data regarding human exposure to MNPLs. The total load of plastic particles that humans are exposed to has been estimated based on these newly reported studies. This analysis of novel literature shows that despite ingestion is the most studied route of exposure, other routes of contact with MNPLs should not be underestimated. At the same time, gaps regarding the investigation of human exposures to environmental MNPLs have been detected, as well as the lack of robust and standardized protocols, operating procedures, and methodologies to detect/quantify MNPL in human/biological matrices.
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Human exposure to micro- and nanoplastics: routes, accumulation, and health implications
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This review synthesizes evidence that microplastics and nanoplastics have been detected in human blood, placenta, breast milk, and stool, with emerging associations between internal MNP burdens and inflammatory, cardiometabolic, and potential reproductive effects. Humans are exposed through ingestion, inhalation, skin contact, and medical interventions, making microplastic accumulation in the body a pressing public health concern requiring urgent research into clinical health outcomes.
Microplastic Pollution: Human Exposure, Uptake, Accumulation Pathways, and Potential Health Consequences
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Researchers reviewed the exposure routes, uptake mechanisms, and accumulation pathways of microplastics in the human body, concluding that the ubiquitous presence of these particles warrants urgent investigation into their long-term ecological and health consequences.
Sources of Microplastics in the Environment and Human Exposure Routes: A Review
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Researchers reviewed the major sources of environmental microplastic pollution — dominated by textiles, tires, and urban dust — and catalogued the primary human exposure routes via food, inhalation, and skin contact, noting that airborne MPs are an underestimated risk because fine particles can bypass respiratory defenses and penetrate deep into the lungs.
Lifetime exposure to microplastics: From consumption to distribution in the body
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This review pulls together existing research to estimate that over a lifetime, the average person swallows or breathes in about 224 million tiny plastic particles, and roughly 59% of that stays in the body rather than being flushed out. Exposure builds up most during adulthood, mainly from foods like edible oils and fruits, plus air, and these particles have been found lodged in various organs, including surprisingly high levels in ovarian fluid. While scientists are still figuring out exactly how this affects health, the sheer scale of lifelong buildup is a strong signal that reducing plastic exposure, especially in food and packaging, deserves serious
Health risk of human exposure to microplastics: a review
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Researchers reviewed the human health risks of microplastic exposure across multiple organ systems, finding evidence that these particles trigger oxidative stress, disrupt gut microbiota, impair liver and cardiovascular function, suppress immunity, and — through leached additives like phthalates — act as endocrine disruptors with synergistic effects when combined with co-occurring environmental pollutants.
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