If you are South Asian or Indian, the standard BMI chart probably understates your health risk. The usual World Health Organization cut-offs - overweight at a BMI of 25 and obese at 30 - were calibrated mainly on White European populations, and they let too much risk slip through for people of South Asian descent.
You should use lower thresholds: overweight starts at a BMI of 23 and obesity at around 27.5. These revised cut-offs come from the WHO 2004 expert consultation published in The Lancet, and India's own ICMR and Ministry of Health guidelines use similar revised numbers. The reason is simple but important - South Asians develop type 2 diabetes and heart disease at a lower body weight than the standard chart assumes.
Key takeaways
- Use lower cut-offs. For South Asians, overweight begins at a BMI of 23 and obesity at around 27.5, not 25 and 30.
- Same BMI, more fat. At an identical BMI, South Asians carry more total body fat and more visceral fat around the organs than White Europeans.
- The "thin-fat" phenotype is real. Many South Asians look slim and sit in the normal BMI range while being metabolically overweight - sometimes called normal-weight obesity.
- Risk climbs earlier. Type 2 diabetes, insulin resistance, and heart disease appear at lower BMI levels in South Asians than in most other groups.
- Measure more than BMI. Track waist circumference, waist-to-height ratio, and body fat percentage - they capture central fat that BMI misses.
Why doesn't standard BMI work for Indians?
BMI is just weight divided by height squared. It says nothing about how much of your weight is fat, where that fat sits, or how much muscle you carry. That is a problem for everyone, but it is a bigger problem for South Asians because of a consistent difference in body composition.
At any given BMI, people of South Asian origin tend to have a higher percentage of body fat and more abdominal, visceral fat than White Europeans, alongside relatively lower muscle mass. So an Indian man with a BMI of 24 - comfortably "normal" on the standard chart - may carry the fat profile and metabolic risk that the chart only expects at a BMI of 27 or 28.
This was the core finding behind the WHO 2004 expert consultation in The Lancet , which concluded that the health risks of Asian populations rise from a lower BMI than the standard thresholds suggest. The result is a real risk of under-diagnosis if you read your number against the wrong chart. We cover the general limits of the metric in our guide to why BMI is inaccurate.
What are the BMI cut-offs for South Asians?
The WHO recommended adding lower "action points" for Asian populations rather than replacing the international classification entirely. In practice, that means reading your BMI against a shifted scale. India's revised obesity guidelines, including those informed by the ICMR, follow a similar pattern.
| Category | Standard WHO BMI | Asian / South Asian BMI |
|---|---|---|
| Underweight | Below 18.5 | Below 18.5 |
| Normal weight | 18.5–24.9 | 18.5–22.9 |
| Overweight / increased risk | 25–29.9 | 23–24.9 |
| High-risk action point | 30 and above | 25 and above |
| Obese | 30 and above | 27.5 and above |
Two numbers matter most here. A BMI of 23 marks the point where risk begins to climb, and 25 is treated as a high-risk action point for South Asians - the level at which many clinicians recommend active intervention. Formal obesity is generally set at 27.5 and above. If you want the general-population view for comparison, see our explainer on what is a healthy BMI.
The formula itself does not change. You can calculate the raw figure with our BMI Calculator and then interpret it against the lower Asian thresholds above rather than the default chart.
What is the "thin-fat" Indian phenotype?
The "thin-fat" phenotype describes a body that looks slim on the outside but carries a high proportion of fat on the inside - particularly around the abdomen and internal organs - with comparatively little muscle. It is also called the normal-weight-obese phenotype, because the BMI reads as normal while the body composition does not.
This pattern has been observed from birth in South Asian populations: studies describe Indian newborns as relatively low in weight but high in body fat compared with European babies. Across a lifetime, that tendency to store fat centrally rather than build muscle helps explain why diabetes and heart disease appear so early and at such low body weights in this group.
The practical message is uncomfortable but useful: a flat or slim-looking frame does not guarantee you are metabolically healthy. A normal BMI in a South Asian body can still hide a high-risk fat distribution.
Why visceral fat matters more here
Visceral fat is the fat packed around your liver, pancreas, and intestines. It is far more metabolically active - and more dangerous - than the subcutaneous fat under your skin. It drives insulin resistance, inflammation, and abnormal blood lipids.
Research consistently shows South Asians carry more visceral fat than other groups at the same BMI and the same waist size, which is a major reason their risk of type 2 diabetes and cardiovascular disease is elevated . That is fat BMI can never see, which is why no single number from a height and weight ratio can settle the question on its own.
What should you track instead of BMI?
BMI is still a fine starting point - quick, free, and directionally useful when read against the right chart. But for South Asians especially, it should be one number among several. The most useful additions all capture central fat.
Waist circumference
Because South Asians store fat centrally, waist size is one of the most telling measurements you can take. Indian guidelines use lower cut-offs than Western ones - abdominal obesity is often flagged at a waist of around 90 cm for men and 80 cm for women, compared with roughly 102 cm and 88 cm in standard Western thresholds.
Waist-to-height ratio
Dividing your waist by your height accounts for body size and is a strong, simple predictor of cardiometabolic risk. A common rule of thumb is to keep your waist below half your height - a ratio under 0.5.
Body fat percentage
Since the South Asian issue is fundamentally about fat versus muscle, an actual body fat estimate is valuable. Our Body Fat Calculator uses the Navy method, which incorporates your waist measurement and therefore captures some of the central-fat signal that BMI ignores.
Blood markers and fitness
Fasting blood glucose, HbA1c, blood pressure, and a lipid panel say far more about your metabolic health than any single body measurement. Given the early onset of diabetes in South Asians, screening earlier and more often is a reasonable, evidence-based precaution to raise with your doctor.
Putting it together
If you are South Asian or Indian, treat a BMI of 23 as your watch line and 25 as the point to act, rather than waiting for 30. Pair that number with a waist measurement and, ideally, an occasional check of your blood glucose and blood pressure. None of this is cause for alarm - it is simply a more accurate frame for a body type the standard chart was never built around.
The goal is not to fixate on a lower number. It is to make sure the number you do use is telling you the truth. For South Asians, the standard BMI chart often does not - and a small adjustment to the thresholds, plus a tape measure, closes most of that gap.
Frequently asked questions
What is a healthy BMI for South Asians and Indians?
Generally below 23. The overweight range starts at a BMI of 23 and the obese range at around 27.5 - lower than the standard cut-offs of 25 and 30 used for the general population.
Why are BMI cut-offs lower for Indians?
Because South Asians carry more body fat and more visceral fat at the same BMI than White Europeans. This raises their risk of type 2 diabetes and heart disease at a lower body weight, so a lower threshold flags risk earlier.
What is the thin-fat or normal-weight-obese phenotype?
It describes South Asians who look slim and have a normal BMI but carry a high proportion of body fat, especially around the abdomen and organs, with relatively low muscle mass. It is linked to higher metabolic risk.
At what BMI is an Indian considered obese?
Under the revised Asian and Indian guidelines, obesity is generally a BMI of 27.5 or above, compared with 30 for the general population. A BMI of 23 to 27.4 is classed as overweight or at increased risk.
Should South Asians measure waist circumference too?
Yes. Because South Asians store more fat centrally, waist circumference and waist-to-height ratio are especially useful. Indian guidelines often use a lower waist cut-off of around 90 cm for men and 80 cm for women.
Does the BMI calculator change for Indians?
The formula stays the same - weight in kilograms divided by height in metres squared. What changes is interpretation. Read the result against the lower Asian cut-offs rather than the standard chart.