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Gut barrier breach and glucose dysregulation: the dual threat of food-transformed microplastics
Summary
Scientists found that when microplastics from plastic water bottles mix with food (especially starchy foods) during digestion, they get chemically altered in ways that make them more harmful to your gut. In lab tests, these food-transformed microplastics damaged the protective lining of the intestines and appeared to increase glucose absorption, meaning they could potentially affect blood sugar levels beyond just causing gut irritation. This suggests that what you eat alongside microplastic-contaminated food and water may influence how much damage those plastics actually cause in your body.
The widespread presence of polyethylene terephthalate microplastics (PET-MPs) in the environment raises concerns about their potential health impacts, which undergo complex physicochemical transformations during gastrointestinal digestion, yet how these alterations modulate their intestinal toxicity remains poorly understood. Here, employing a simulated digestion simulator coupled with an intestinal epithelial model, we demonstrate that PET-MPs, derived from commercial water bottles, experience extensive surface modification and biocorona formation in the digestive tract. The presence of a starch food matrix markedly accelerates these transformations, leading to increased particle aggregation and altered surface charge. These modified PET-MPs trigger a biphasic disruption of intestinal barrier function, characterized by an initial acute mucosal defense phase (neutral mucin hypersecretion) that is rapidly overwhelmed by sustained particle burden, transitioning into a secondary structural breakdown phase marked by severe oxidative stress, loss of epithelial integrity, and cytotoxicity. Furthermore, digested PET-MPs enhance the bioaccessibility and glucose transportation, potentially elevating systemic glycemic exposure. Our findings reveal that food matrix-driven transformations critically dictate the gastrointestinal fate and toxicity of microplastics, highlighting a previously underappreciated pathway through which dietary microplastics may compromise intestinal homeostasis and nutrient metabolism.