Is Your BMI Actually Accurate?
BMI has been the default health metric for decades — but is it telling you the truth? Here's what BMI gets right, where it fails, and what to measure instead.
Body Mass Index (BMI) is calculated as weight in kg divided by height in metres squared. It's simple, free, and widely used — but deeply flawed for individual health assessment.
Where BMI fails: It can't distinguish muscle from fat. A lean bodybuilder and an obese person can have the same BMI. It also ignores fat distribution — and abdominal fat is far more dangerous than fat on hips and thighs.
Indians need different thresholds. Standard BMI cutoffs (overweight >25, obese >30) were derived from European populations. Indians develop metabolic disease at lower BMIs. Revised Indian guidelines: overweight >23, obese >25.
The "skinny-fat" problem. Many Indians have normal BMI but high body fat percentage and low muscle mass. They look lean but have the metabolic profile of someone obese — diabetes, fatty liver, high triglycerides.
Better metrics to track:
Waist circumference — Under 90 cm for men, 80 cm for women. Measure at the navel, standing relaxed. This single number predicts heart disease better than BMI.
Waist-to-height ratio — Your waist should be less than half your height. Simple rule: keep your waist at under 0.5x your height in cm.
Body fat percentage — Healthy ranges: 10–20% men, 18–28% women. Measured via DEXA scan (gold standard), bioimpedance scales, or skinfold calipers.
When BMI is still useful. For population-level health screening and tracking weight trends over time in the same person, BMI is fine. It's a rough starting point — just don't treat it as the final word on your health.
Medical disclaimer: This article is for informational purposes only and does not replace professional medical advice. Always consult your doctor for specific health concerns.
