MICROPLASTICS exposure was associated with higher rates of stroke, diabetes, and hypertension in coastal communities, according to a new analysis that highlights the potential cardiometabolic impact of these increasingly pervasive environmental pollutants.
Microplastics, tiny synthetic polymer particles measuring less than 5 mm, have been detected in oceans, drinking water, food supplies, and even human tissues. While growing evidence has linked microplastics to inflammation and cardiovascular damage, population-level data examining their relationship with chronic disease have remained limited.
Microplastics and Chronic Disease Prevalence
Researchers conducted a cross-sectional analysis of 709 coastal census tracts located within 200 m of the shoreline. The team linked marine microplastic measurements from the National Oceanic and Atmospheric Administration with chronic disease prevalence estimates from the CDC PLACES database.
To minimise confounding, investigators incorporated 154 demographic, socioeconomic, and environmental variables into their analysis. These included age, sex, race, median household income, insurance coverage, Social Vulnerability Index scores, and exposure to fine particulate air pollution (PM2.5).
Higher Microplastics Exposure Linked to Stroke Risk
After adjustment for these factors, census tracts with the highest levels of microplastics exposure showed significantly higher prevalence of several chronic conditions compared with areas with low exposure.
The strongest association was observed for stroke, with a prevalence ratio of 1.21 (95% CI: 1.13–1.29). Elevated exposure was also associated with diabetes (prevalence ratio: 1.17; 95% CI: 1.10–1.24) and hypertension (prevalence ratio: 1.10; 95% CI: 1.06–1.14).
Machine Learning Highlights Microplastics as Key Predictor
The researchers also applied machine learning techniques using XGBoost models combined with SHAP interpretation. Among all demographic, socioeconomic, and environmental variables examined, microplastic concentration emerged as one of the most important environmental predictors of stroke prevalence.
This finding suggests that microplastics may contribute to chronic disease patterns independently of many established risk factors, although the study was not designed to establish causation.
Implications for Future Research
The authors emphasised that these findings are observational in nature. As a result, they cannot determine whether microplastics directly cause stroke, diabetes, or hypertension.
However, the results add to growing concerns about the potential health consequences of environmental microplastic contamination.
Further longitudinal and mechanistic studies will be needed to determine how microplastics may influence cardiovascular and metabolic health, and whether reducing exposure could help lower disease risk in vulnerable populations.
Reference
Ponnana SR et al. Marine microplastic concentration and associations with stroke and chronic disease prevalence. npj Cardiovasc Health. 2026;DOI:10.1038/s44325-026-00133-6.
Featured image: Rajat on Adobe Stock
