Health for South Asians

"I am Indian. My family has the typical pattern: early heart disease on one side, type 2 diabetes on the other. Most of my South Asian patients have been told their labs are 'normal' for years and shown me their cardiologist's notes after a stent in their late 40s. The workup that catches this in time is not exotic. It is just not the default."

A 41-year-old Indian software engineer sat down in my office last fall. BMI 24.5 (called "normal" everywhere). A1C 5.6 (called "normal"). LDL 118 (called "borderline"). Standard primary care had told him for 5 years he was fine. His ApoB was 142, his Lp(a) was 188 nmol/L, and his coronary calcium score was 110 at age 41 (a score that would be in the 90th percentile for a man two decades older). He had been quietly building plaque for a decade while every annual physical reassured him.

Why Do South Asians Develop Heart Disease and Diabetes Early?

South Asians develop heart disease and diabetes roughly 10 years earlier than European-descent populations, and at significantly lower body weights. The drivers are well-documented in the medical literature (the MASALA study at UCSF is the foundational US dataset) and run across several mechanisms:

• Limited adipose storage capacity. South Asian bodies store fat preferentially in the abdomen, the liver, and around the heart (visceral fat) rather than under the skin (subcutaneous fat). At the same body weight as a European-descent peer, a South Asian person typically has more visceral fat and less subcutaneous fat. Visceral fat is metabolically toxic; subcutaneous fat is much less so.
• Early insulin resistance. South Asians develop insulin resistance at lower BMI and lower waist circumference than other populations. Fasting insulin tends to be higher at any given glucose. The slide toward type 2 diabetes often starts in the 20s and 30s in this group.
• Higher Lp(a). Approximately 25% of South Asians have lipoprotein(a) levels above 50 mg/dL, higher than European-descent populations (about 20%) and East Asians (about 10%), though lower than African populations (about 30%). Because of population size, South Asians carry roughly 33% of the global burden of elevated Lp(a). Lp(a) is genetic, mostly fixed for life, and an independent risk factor for atherosclerosis and aortic valve disease.
• Lower muscle mass. Average South Asian skeletal muscle mass is lower than average European-descent muscle mass at the same BMI. Lower muscle mass means lower insulin sensitivity, lower resting metabolic rate, and faster sarcopenia.
• Early-life undernutrition history. Multi-generational patterns of childhood undernutrition followed by adult adiposity (the "thrifty phenotype") may set a metabolic environment that runs lean at the start of life and overshoots in adulthood.

These mechanisms compound. A 2024 review in the Journal of the Endocrine Society named the dual threat: premature coronary artery disease and early-onset type 2 diabetes mellitus, sharing common pathways and amplifying each other.

Why Does Standard BMI Mislead for South Asians?

Standard BMI cutoffs were derived primarily from European-descent populations. South Asians develop metabolic disease at lower BMIs than these cutoffs suggest. The WHO Expert Consultation in 2002 acknowledged this and proposed lower public-health action points for Asian populations:

The clinical implication: a South Asian patient with a BMI of 24 (called "normal" on the standard chart) is at meaningfully higher metabolic risk than the chart suggests. A BMI of 27 is in the obesity range, not the overweight range.

The American Diabetes Association now recommends screening Asian Americans for diabetes at a BMI of 23 and above, not 25. Most US primary care still uses the higher threshold, which is why many South Asian patients are not screened until well after the disease has begun.

What Is TOFI ("Thin Outside, Fat Inside")?

TOFI is a clinical phenotype common in South Asians: normal or low BMI on the outside, but high visceral fat, hepatic fat, and metabolic dysfunction on the inside. The pattern produces:

• Normal weight on the scale
• Normal-looking body shape on visual exam
• Elevated fasting insulin and A1C
• Elevated triglycerides and low HDL
• Non-alcoholic fatty liver disease (NAFLD) on imaging
• Higher ApoB at the same LDL as a European-descent peer
• Premature coronary calcium on CT

TOFI is dangerous because it does not trigger any of the standard visual or BMI-based warning signs. A patient can be lean, eat reasonably, and still be heading toward early diabetes and heart disease.

The detection requires a workup that looks for the actual metabolic markers, not body shape. Waist circumference and waist-to-height ratio are useful additions to BMI but still imperfect. The lab panel below is the real answer.

What Labs Should South Asians Actually Get?

A complete first-pass workup for an adult South Asian patient, in my practice, looks like this. Many of these are not part of standard insurance-based primary care annual labs.

Lipid and atherosclerosis markers:

• ApoB (target generally under 80 mg/dL in primary prevention; under 60 in higher-risk patients). The single most informative atherogenic lipoprotein measure.
• Lp(a) (test once in a lifetime; under 75 nmol/L is reassuring, over 125 nmol/L raises lifetime cardiovascular risk substantially).
• Full lipid panel with LDL particle number when available
• hs-CRP (inflammation marker)
• Homocysteine

Glucose and insulin:

• Fasting glucose and hemoglobin A1C
• Fasting insulin (target generally under 6 µIU/mL; insulin resistance starts above 6, often much earlier in South Asians)
• HOMA-IR calculation (fasting glucose x fasting insulin / 405)
• Consider a 2-hour glucose tolerance test or CGM if fasting numbers look reassuring but family history is strong

Thyroid and hormones:

• TSH, free T4, free T3, TPO antibodies

Liver and metabolic:

• ALT, AST, GGT (screening for fatty liver)
• Ferritin and iron studies (anemia, hemochromatosis screen)

Nutrient panel:

• 25-hydroxy vitamin D (often low in South Asians due to skin pigmentation and limited sun exposure)
• Vitamin B12 and folate (vegetarian patients especially)
• Omega-3 index

Imaging when indicated:

• Coronary artery calcium (CAC) score by CT in men 35 to 40 and women 40 to 45, earlier with family history. Cheap (around $100 out of pocket in most cities), fast, no contrast.
• Coronary CT angiography (CTA / Cleerly) in patients with elevated CAC or strong family history.
• Hepatic ultrasound or FibroScan if fatty liver is suspected.
• DEXA scan for body composition (not just bone density). Higher visceral fat at lower BMI is the South Asian story; a DEXA quantifies it.

This is the panel I run on day one for a South Asian patient with any family history of early heart disease or diabetes. It catches problems 10 to 20 years before symptoms.

What Do the Numbers Actually Mean for South Asians?

A few specifics where the South Asian interpretation differs from the standard:

LDL of 130 mg/dL.

• Standard interpretation: borderline, lifestyle advice.
• South Asian interpretation: with elevated Lp(a) and an early family history, the same LDL is meaningfully higher risk. Treatment threshold drops; goals tighten.

A1C of 5.7.

• Standard interpretation: prediabetes, monitor.
• South Asian interpretation: combined with high fasting insulin and visceral fat, this is a 10-year warning for type 2 diabetes that needs action, not monitoring.

ApoB of 95 mg/dL.

• Standard interpretation: at or slightly above population average.
• South Asian interpretation: too high given baseline cardiovascular risk; target lower (often under 80, sometimes under 60).

Lp(a) of 110 nmol/L.

• Standard interpretation: noted, often ignored.
• South Asian interpretation: a real risk-multiplier that should tighten every other risk factor target for the rest of life.

BMI of 25 with a waist of 36 inches.

• Standard interpretation: overweight, average male waist.
• South Asian interpretation: technically Asian-obese (BMI > 23 = overweight, > 27.5 = obese), with a waist above the South Asian risk threshold of 35.4 inches (90 cm) for men. Action item, not reassurance.

The numbers are not different. The interpretation is.

Guidance from the Clinic

"I do not run different tests on my South Asian patients because their biology is different. I run the right tests because the standard tests miss too much in this group. The story I see over and over is a normal-looking 40-year-old whose calcium score reveals what their LDL and BMI never did. Once you know, you can do something about it. Before you know, you cannot."

What Treatment Looks Like

Treatment for elevated cardiometabolic risk in South Asians follows the same evidence-based pathways as any other patient, but the thresholds are tighter and the action comes earlier.

Foundational moves (every patient):

• Resistance training, 2 to 4 days a week. Higher leverage in South Asians because of the lower baseline muscle mass. Muscle is the largest insulin-sensitive tissue in the body; building it raises insulin sensitivity directly.
• Protein, 1.6 to 2.2 g per kg per day. Often under-consumed in traditional South Asian diet patterns that lean heavily on rice, lentils, breads, and dairy.
• Carbohydrate quality and timing. Lower glycemic load. Protein before carbs at meals. Walking after meals reliably blunts post-meal glucose spikes.
• Sleep. 7 to 9 hours, with sleep apnea ruled out (more common in South Asians than population average).
• Vitamin D correction. Target above 40 ng/mL.
• Alcohol moderation. Particularly relevant given liver-fat predisposition.

Pharmacologic options when indicated:

• Statin therapy at lower thresholds, given the higher baseline risk and earlier event timing.
• Metformin for prediabetes or early type 2 diabetes, especially with high fasting insulin or visceral fat.
• GLP-1 receptor agonists (semaglutide, tirzepatide) for select patients with significant metabolic dysfunction.
• PCSK9 inhibitors or bempedoic acid for patients with high Lp(a) plus elevated LDL who do not reach goals on statins alone.
• Berberine, inositol as adjuncts in some patients (limited but real evidence base).

The treatment plan should be personalized. The point is not that South Asians need more medication; the point is that South Asians often need attention paid at numbers that the standard guidelines treat as low priority.

Diet and Cultural Considerations

A few practical notes on traditional South Asian dietary patterns and metabolic health:

• Refined carbohydrates (white rice, naan, parathas, biscuits) are central to many regional cuisines and the largest single-driver of post-meal glucose spikes for many patients. Swapping to whole-grain or lower-glycemic options (millet, brown rice, cauliflower rice, ragi, dosa with less rice) makes a measurable difference.
• Protein density is often lower than ideal in vegetarian or near-vegetarian eating patterns. Pulses, paneer, tofu, dairy, eggs, and (for non-vegetarians) chicken, fish, and eggs at each meal raise total intake without major cultural disruption.
• Cooking fats: ghee in moderation is fine; the larger issue is total saturated fat density when ghee, dairy, and fried items stack across meals. Olive oil, mustard oil, and avocado oil are reasonable additions for daily cooking.
• Sweets and desserts (mithai, halwa, kheer, ladoos) are central to celebrations and family rhythm. Strict elimination usually fails; portion-and-frequency strategies that preserve cultural rhythm work better.
• Vegetarian or vegan patterns require careful attention to vitamin B12, vitamin D, iron, omega-3 (algae oil), and total protein intake.

The cultural piece matters. A plan that ignores how food actually moves through a South Asian household and extended family will not last. A plan that adapts to it can.

How Fishtown Medicine Approaches South Asian Health

At Fishtown Medicine, the South Asian workup is the standard full hormone-and-metabolic panel I run for most new adult patients, plus the cardiovascular-specific markers (ApoB, Lp(a), hs-CRP) and earlier imaging thresholds for CAC and CTA. The visit is 60 to 90 minutes; the lab order is placed on day one; the follow-up is by text.

The reason this matters: most South Asian patients I see have spent years in standard 15-minute primary care visits where the questions never got asked and the right tests never got ordered. By the time the first event happens, the damage is set in motion. The right model is preventive, lab-driven, and started in the 30s and 40s, not the 50s and 60s.

Dr. Ash is Indian. The cultural translation work that most South Asian patients have to do (explaining family history patterns, explaining diet, navigating relatives' health stories) is shorter in this practice.

The Bottom Line

South Asians develop diabetes and heart disease about a decade earlier than European-descent populations, often at body weights and lab values that standard primary care calls "normal." The biology is real. The standard guidelines have not caught up. The workup that catches the actual risk in time is not exotic: ApoB, Lp(a), fasting insulin, A1C, full lipid panel, and a coronary calcium score at the right age. The treatment is the same evidence-based playbook used for any patient, just started earlier and pushed harder on tighter targets. Most of the damage is preventable when the workup happens in the 30s and 40s. Almost none of it is preventable once the first event has happened in the 50s.

Key Takeaways

• South Asians develop diabetes and CAD about 10 years earlier than European-descent populations.
• WHO BMI cutoffs for Asians are lower: overweight at 23, obesity at 27.5.
• About 25% of South Asians have elevated Lp(a), contributing to ~33% of the global Lp(a) burden.
• The TOFI phenotype (thin outside, fat inside) is common and hides risk from standard exams.
• The right workup includes ApoB, Lp(a), fasting insulin, A1C, full lipid panel, and earlier coronary calcium scoring.

Scientific References and Sources

1. MASALA Study. "Publications." Mediators of Atherosclerosis in South Asians Living in America cohort, UCSF.
2. Bhalodkar NC, Blum S, Rana T, et al. (multiple papers). MASALA-derived cardiovascular risk-enhancing factors and coronary artery calcium analyses, including the 2022 cardiovascular risk-enhancing factors paper.
3. Chait A, den Hartigh LJ, et al. (2024). "Disentangling Dual Threats: Premature Coronary Artery Disease and Early-Onset Type 2 Diabetes Mellitus in South Asians." Journal of the Endocrine Society. PMID: 38178904.
4. Verma S, Pidikiti M, et al. (2025). "Role of Lipoprotein(a) in Atherosclerotic Cardiovascular Disease in South Asian Individuals." Journal of the American Heart Association.
5. WHO Expert Consultation. (2004). "Appropriate body-mass index for Asian populations and its implications for policy and intervention strategies." The Lancet.
6. Hsu WC, Araneta MR, Kanaya AM, et al. (2015). "BMI Cut Points to Identify At-Risk Asian Americans for Type 2 Diabetes Screening." Diabetes Care, 38(1), 150-158.

Dr. Ashvin Vijayakumar (Dr. Ash) is a board-certified internal medicine physician at Fishtown Medicine in Philadelphia. He is South Asian and runs the full South Asian cardiometabolic workup as part of a single 60- to 90-minute first visit.