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Bridging environmental pollution and immune dysregulation: How microplastics disrupt gut homeostasis to promote allergic diseases
Summary
This review pulls together existing research to propose a possible explanation for why allergies are becoming more common: tiny plastic particles we swallow may damage our gut lining and kill off helpful gut bacteria that normally produce compounds keeping our immune system in check. Without those compounds, the theory goes, our airways become more reactive to allergens like pollen or dust. This is still a proposed idea rather than proven fact, but it suggests gut health could eventually become part of how doctors screen for and treat allergies—and it's another reason to be mindful of reducing plastic exposure in food and water.
Parallel increases in microplastic (MP) pollution and allergic diseases suggest an environmental link in allergy pathogenesis. While intestinal barrier dysfunction and dysbiosis are hallmark features of allergic diseases, the mechanisms by which persistent MPs drive these processes remain unclear. This review proposes a mechanistic pathway where orally ingested MPs disrupt the intestinal barrier through physical and chemical toxicity, precipitating functional dysbiosis. Specifically, MPs suppress key short-chain fatty acid (SCFA)-producing commensals. The resulting SCFA deficit impairs the "gut-airway axis," weakening respiratory immune tolerance and increasing allergen susceptibility. We further argue for integrating gut health assessments into standardized allergy diagnostics and treatments. Despite this novel perspective, significant knowledge gaps remain regarding causality, dose-response relationships, and specific biomarkers. Addressing these challenges is critical for translating scientific findings into public health policies and clinical interventions to mitigate the rising global burden of allergic diseases.