## Epidemiological Facts on Type 2 Diabetes in India ### Correct Statements **High-Yield:** India bears the largest disease burden of diabetes globally. The IDF Diabetes Atlas projects India will have the highest absolute number of people with diabetes (>100 million) by 2030, despite not having the highest prevalence rate. **Key Point:** Urban–rural disparity is a hallmark of diabetes epidemiology in India. Urban areas show 2–3 times higher prevalence due to: - Sedentary lifestyle - Westernized diet - Obesity - Better access to diagnosis (detection bias) **Clinical Pearl:** Age-related prevalence increases progressively across age groups (15–29 years: ~2%, 30–44 years: ~5%, 45–59 years: ~10%, 60+ years: ~15–20%), with a steeper rise in middle age but continued increase even in the elderly. ### Why Option 3 Is Wrong **Genetic Susceptibility in Indians:** Indians have **HIGHER**, not lower, genetic susceptibility to Type 2 DM compared to Caucasians. This is why: - Indians develop diabetes at a younger age (mean age ~43 years vs. ~55 years in Caucasians) - Lower BMI thresholds trigger diabetes in Indians (BMI >23 kg/m² is considered overweight in Asian populations vs. >25 in Caucasians) - The "thrifty genotype" hypothesis suggests ancestral adaptation to famine predisposes South Asians to metabolic syndrome **Warning:** This is a common trap—confusing genetic susceptibility with prevalence rates. High prevalence in developed countries is due to lifestyle + detection, not greater genetic risk. ### Comparative Table: Genetic Risk Across Populations | Population | Genetic Susceptibility | Age of Onset (years) | BMI Threshold (kg/m²) | Prevalence Driver | | --- | --- | --- | --- | --- | | South Asian (Indian) | **High** | 40–45 | 23 | Genetics + lifestyle | | Caucasian | Moderate | 50–55 | 25 | Lifestyle + obesity | | East Asian | Moderate–High | 45–50 | 24 | Genetics + lifestyle | | African | High | 45–50 | 25 | Genetics + lifestyle | [cite:Park 26e Ch 7]
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