A recent global review has identified a potential connection between long-term exposure to fine particulate matter (PM2.5) and an increased risk of developing type 2 diabetes. The study, which was published last month in the Journal of Vascular Diseases, analysed 13 previous systematic reviews and meta-analyses to examine the health impacts of polluted air beyond respiratory concerns.
Researchers found that for every 10-microgram increase per cubic metre in PM2.5 exposure, the risk of developing type 2 diabetes rose by 10% to 16%. A specific analysis focusing on South Asian populations, which included residents of India, Bangladesh, and Sri Lanka, identified a 9% higher risk for the same level of increase in pollutant exposure.
The review covered more than 200 million cumulative participant observations across regions including North America, Europe, Australia, and parts of Asia and Latin America. Beyond new cases of diabetes, the researchers linked PM2.5 exposure to higher fasting blood glucose levels, diabetes prevalence, and diabetes-related mortality. However, the study noted that no significant association was found regarding insulin resistance, and evidence regarding HbA1c levels remained insufficient.
Dr. Anoop Misra, co-author of the study and Executive Chairman of the Fortis C-DOC Centre of Excellence for Diabetes, Metabolic Diseases and Endocrinology in New Delhi, stated that air quality management must be integrated into diabetes prevention efforts. He noted that air pollution should be considered a factor within the cardiovascular-kidney-metabolic health continuum.
Key facts
- The study analysed 13 systematic reviews and meta-analyses.
- A 10-microgram per cubic metre increase in PM2.5 is associated with a 10% to 16% higher diabetes risk globally.
- Populations in India, Bangladesh, and Sri Lanka faced a 9% heightened risk per similar increase.
- Researchers identified potential mechanisms such as oxidative stress and inflammation, but noted causation is not yet proven.
Why it matters
The study authors highlighted that while the results show an association, they do not provide definitive proof that air pollution causes diabetes. Researchers have called for air quality to be viewed as a critical component in broader strategies aimed at preventing metabolic, kidney, and cardiovascular diseases.
Source: Times of India
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