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Microplastics as Microbiota Modulators: Rewiring the Gut Metabolism Immune Axis.
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This review summarizes existing research on how microplastics may affect gut bacteria, the gut's protective lining, and digestive chemical signals, mostly based on animal and lab cell studies. These changes were linked to inflammation and disrupted metabolism in those studies, but human evidence remains limited, and researchers call for more standardized studies.
Microplastics (MPs) have emerged as pervasive environmental contaminants with increasing relevance to human health. Beyond their role as inert particulate pollutants, accumulating evidence suggests that MPs may act as biologically active modulators of the gastrointestinal ecosystem. The gut represents a major interface for MP exposure, where ingested particles interact with intestinal epithelial cells, mucus layers, immune components, and resident microbial communities. This review summarizes current evidence on MPs' capacity to alter gut microbiota composition, impair intestinal barrier integrity, disrupt microbial metabolite production, and promote inflammatory and metabolic disturbances.Experimental studies indicate that MP exposure may reduce microbial diversity, shift the abundance of key bacterial taxa, impair tight junction proteins, and increase intestinal permeability. These changes may facilitate the translocation of bacterial products such as lipopolysaccharide, thereby activating inflammatory pathways including TLR4/NF-κB signaling. In parallel, MP-associated dysbiosis may alter short-chain fatty acids, bile acid metabolism, and tryptophan-derived metabolites, suggesting plausible biological pathways relevant to insulin resistance, hepatic lipid dysregulation, cardiometabolic risk, and gut-brain axis disruption. However, most available evidence is derived from animal and in vitro models, and causal relationships in humans remain insufficiently established. Major limitations include heterogeneous exposure protocols, non-standardized particle characterization, limited human longitudinal data, and difficulty separating particle-specific effects from those of associated chemical contaminants.Future studies integrating environmentally realistic exposure models, standardized microbiome analyses, multi-omics approaches, and human cohort designs are needed. Overall, the gut microbiota may represent a critical biological interface through which MPs interact with host physiology; however, further evidence is required before definitive conclusions can be drawn regarding their role in human chronic disease susceptibility.
More Papers Like This
Micro(nano)plastics and Their Potential Impact on Human Gut Health: A Narrative Review
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This review summarizes research on how micro- and nanoplastics affect the gut, finding that they can damage the intestinal lining, trigger immune responses, and disrupt the balance of beneficial gut bacteria in both cell studies and animal models. Since humans are primarily exposed to microplastics through food and food packaging, understanding these gut effects is essential for assessing the true health risks of plastic pollution.
Microplastics, Gut Microbiota, and Obesity: An Emerging Environmental Health Concern
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This review summarizes existing research on microplastics found in human feces, tissues, water and air. In animal studies, swallowed microplastics reduced gut microbe diversity, increased harmful bacteria and disrupted gut barriers, linked to inflammation and altered fat metabolism. Limited human studies suggest possible links between fecal microplastics, plastic packaging use, gut microbe changes and higher BMI, though more research is needed.
Microplastic Toxicity and Intestinal Homeostasis: Insights from Microbiome and Gut Barrier Dysfunction
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This review pulls together animal, lab, and human studies suggesting that microplastics we eat, drink, and breathe can disrupt the balance of good and bad bacteria in our gut, weaken the gut's protective lining, and trigger inflammation—effects that may ripple out to metabolism, hormones, and even brain function. While most of this evidence comes from animal and lab studies using higher doses than humans typically encounter, it's an early warning sign that everyday plastic exposure could quietly affect long-term gut health, and researchers say we need bigger, more consistent human studies to know how worried to be.
Micro- and nanoplastics and potential perturbation of the microbiota-gut-brain axis.
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This review summarizes existing research on microplastics and nanoplastics and their possible effects on the gut, its microbes, and the brain. Animal studies found changes in gut bacteria, gut barrier function, inflammation, and behavior, but human evidence remains limited and cannot yet show these particles cause brain disease.
Microplastics in Food Production Systems: Sources, Exposure Pathways, and Gastrointestinal Health Effects
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This review pulls together animal research showing that microplastics from our food can disrupt gut bacteria, damage the liver, and mess with metabolism and immune function. Microplastics have also been found in human tissue, but scientists still don't know exactly how much we're exposed to or what it means for our long term health. More human studies are needed before we can say how worried we should be.
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