BMI Myths Indians Need to Stop Believing

BMI is one of the most widely used and most widely misunderstood health metrics in the world. In India, where obesity-related conditions like type 2 diabetes and heart disease are rising rapidly, understanding your BMI correctly is more important than ever.

Myth 1 — A Normal BMI Means You Are Healthy

This is the most dangerous misconception. BMI is a screening tool, not a diagnostic test. It measures weight relative to height — nothing more. It does not measure body fat percentage, muscle mass, blood sugar, cholesterol, or any other actual health indicator.

You can have a perfectly normal BMI and still have high blood pressure, high blood sugar, or dangerous visceral fat (fat around your organs). This condition — sometimes called TOFI (Thin Outside, Fat Inside) — is surprisingly common among Indians.

Myth 2 — The Standard BMI Chart Applies to Indians

The WHO BMI chart was developed based on data from predominantly Western, Caucasian populations. Research consistently shows that Indians develop obesity-related complications at lower BMI thresholds than Western populations.

For Indian adults, the modified thresholds are:

• Underweight: Below 18.5
• Normal weight: 18.5 – 22.9
• Overweight: 23 – 24.9
• Obese: 25 and above

Note: The Indian 'obese' threshold starts at 25, not 30 as in the Western standard.

Myth 3 — Muscular People Are Always Overweight by BMI

This is a genuine limitation of BMI — muscle is denser than fat, so heavily muscular people can have a high BMI despite low body fat. However, this applies to a very small percentage of the population. For most Indians who are not competitive athletes, a high BMI does genuinely indicate excess body fat.

Myth 4 — Being Underweight is Fine if You Feel Okay

India has a significant underweight population, especially among women and in rural areas. A BMI below 18.5 is associated with malnutrition, anaemia, weakened immune function, and complications during pregnancy. Feeling okay is not the same as being healthy — many nutritional deficiencies show no obvious symptoms for years.

Myth 5 — BMI is Useless and Should Be Ignored

Some people dismiss BMI entirely because of its limitations. This is also incorrect. BMI remains a useful, free, easily calculated screening tool that works well as a starting point. The right approach is to use BMI as one data point — alongside waist circumference, waist-to-hip ratio, body fat percentage, and regular blood tests.

What You Should Actually Monitor

• Waist circumference — Indian women: below 80 cm, men: below 90 cm
• Waist-to-height ratio — should be less than 0.5 for most adults
• Fasting blood sugar — especially important given India's high diabetes risk
• Blood pressure — checked at least once a year
• BMI — as a general starting point using Indian-specific thresholds

Frequently Asked Questions