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Association between urinary microplastic load and systemic inflammation and oxidative stress markers in adults
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Researchers found tiny plastic particles (microplastics) in the urine of 91% of adults tested, and people with higher levels also showed more signs of inflammation, cell damage, and weaker antioxidant defenses in their blood, patterns linked to increased disease risk over time. This doesn't prove microplastics are causing these health changes, but it's an early warning sign worth taking seriously, especially since these particles are so hard to avoid in daily life (food packaging, water, air, etc.).
Microplastics (MPs), plastic particles smaller than 5 mm, are ubiquitous environmental contaminants, yet human evidence linking internal MP burden to systemic biological responses remains limited. This cross-sectional study aimed to characterize urinary MP burden and evaluate its associations with systemic inflammation, oxidative stress, antioxidant defenses, and coagulation markers in 420 adults in China. Urinary MPs were quantified by micro-Fourier-transform infrared spectroscopy with confirmatory micro-Raman spectroscopy and expressed as particles per milliliter and per gram of creatinine. Associations with a panel of inflammatory, oxidative-stress, antioxidant, and coagulation biomarkers were assessed using multivariable linear regression, with MP load modeled as both continuous and quartile-based exposures. MPs were detected in 384 of 420 participants (91.4%); median concentrations were 8.6 particles/mL and 12.3 particles per gram of creatinine. Fibers and fragments predominated, and polyethylene (32.4%) and polypropylene (24.7%) were the most prevalent polymer types. In fully adjusted models, higher urinary MP concentration was positively associated with high-sensitivity C-reactive protein (β = 0.28; P < 0.001), interleukin-6 (β = 0.13; P = 0.002), tumor necrosis factor-alpha (β = 0.09; P = 0.028), malondialdehyde (β = 0.09; P < 0.001), 8-hydroxy-2'-deoxyguanosine (β = 0.54; P = 0.003), and fibrinogen (β = 0.07; P = 0.004), and inversely associated with total antioxidant capacity (β = -0.03; P = 0.016) and superoxide dismutase activity (β = -1.14; P = 0.031). Nine associations remained significant after Benjamini-Hochberg correction for multiple comparisons. Quartile analyses showed coherent dose-response trends across most biomarkers. Higher urinary MP burden was associated with a consistent profile of low-grade systemic inflammation, oxidative stress, reduced antioxidant capacity, and mild coagulation disturbance among apparently healthy adults, supporting the biological plausibility of subclinical effects associated with internal MP exposure. However, causality cannot be established because of the cross-sectional study design.
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People living in high-traffic areas breathe in more tiny plastic particles, and this shows up in their urine along with signs of cell damage from oxidative stress. This suggests traffic pollution's plastic particles may harm the body, so reducing exposure in busy traffic areas could help protect your health.
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First study on the toxicokinetic approach of MNPs in an environmentally exposed human population, through their evaluation in blood and urine samples by Pyr-GC-MS and multivariate analysis.
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Scientists tested 98 people's blood and urine and found tiny plastic particles (microplastics and nanoplastics) in nearly everyone—showing up in 98% of urine samples and 89% of blood samples. This confirms that plastic exposure is essentially universal in daily life, and the study suggests urine could become a simple, non-invasive way for doctors and researchers to track how much plastic we're absorbing from our environment.
Human biomonitoring of microplastics and health implications: A review
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This review compiles 91 studies showing that microplastics have been detected in human blood, urine, stool, lung tissue, breast milk, semen, and placenta, confirming widespread human exposure. While our bodies have some ability to clear these particles, microplastics that accumulate in tissues may trigger inflammation, oxidative stress, gut disruption, and reproductive problems. The authors stress that more standardized monitoring methods are needed to fully understand the health consequences.
Microplastics and Their Effects: Environmental Distribution, Analytical Characterization, and Ecological and Human Health Implications
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This review summarizes existing research on tiny plastic particles called microplastics, which have been found in water, soil, air, dust, food and the human body. It covers how they are detected, how people may be exposed, and lab findings that some microplastics caused oxidative stress and inflammation in certain biological systems, while noting differences between studies make results hard to compare.
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