South Asian heart risk: why it arrives a decade early
Heart disease in South Asians presents earlier, hits at lower body weights, and progresses faster than in most other populations. The genetics, the diet, and the metabolism each contribute - and the action items are clearer than the conversation usually admits.
A 45-year-old of South Asian descent has roughly the same cardiovascular risk profile as a 55-year-old of European descent at comparable BMI. The shift is well documented but rarely shows up in screening guidelines that were calibrated on the European reference population.
What's behind the gap
Three things stack. South Asians carry a higher burden of variants associated with insulin resistance and atherogenic lipid profiles - lower HDL, higher small-particle LDL, elevated ApoB. The body composition is also different at any given BMI, with more visceral and ectopic fat than the same BMI in other populations. And the dietary pattern - high in refined carbohydrates relative to fibre - amplifies both effects.
Why screening misses it
The standard cardiovascular risk calculators (Framingham, ASCVD) underestimate risk in South Asians by 25-40% in most validation studies. A 'low risk' reading from one of those calculators in a 45-year-old South Asian male means substantially more than the number suggests. Indian-calibrated risk tools exist but are not yet routinely used.
What to actually do
Start screening earlier - HbA1c, ApoB, lipoprotein(a), fasting insulin - from the late 30s rather than the 50s. Pay particular attention to ApoB and lipoprotein(a), both of which are increasingly recognised as better predictors than the standard LDL panel. And take family history seriously: if a parent had a cardiac event before 55, the genetic loading is real, and prevention starts earlier than the textbook recommends.
- INTERHEART South Asia substudies
- BiB and UK Biobank South Asian cohort analyses
- Indian Heart Association screening guidance