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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
Microplastics are an emerging environmental contaminant, but human exposure levels throughout life and across different age groups remain largely unknown. They enter the human body mainly via ingestion and inhalation. This review estimates the lifetime intake, excretion, and accumulation of microplastics for an average individual across the lifespan, encompassing infants, children, adolescents, adults, and the elderly. The intake is analysed based on the number of microplastics in the consumed liquids, food, air, and plastic containers. An individual ingests about 223.7 million microplastics in their lifetime (range 95 – 5348 million), with about 59% accumulating in the body and 41% being excreted through urine and feces. During the age period of two years, infants ingest microplastics mainly through breast milk and feeding bottles, while other age groups mainly intake microplastics through edible oil, fruits, and air. The lifetime intake of microplastics increases with age from infancy to adulthood due to prolonged exposure. The percentage of total lifetime microplastic accumulation is distributed across age groups as follows: infants (3.7%), children (4.9%), adolescents (11.0%), adults (53.9%), and the elderly (26.5%). Within the body, microplastics are distributed and accumulated across various organs. The highest concentration is found in ovarian follicular fluid (2191 microplastic particles) of females. The current strengths, limitations due to limited imaging techniques and the lack of standard protocols, and considerations for future assessments of microplastics exposure to humans are also discussed. Urgent interventions are needed to address this emerging threat.
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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.
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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.
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