Is Your BMI in the Healthy Range? A Nuanced Look
BMI has been the global standard for screening weight-related health risk for decades. But increasing evidence suggests that two people with identical BMIs can have vastly different health profiles — and that BMI fails to capture this.
Standard BMI Ranges (WHO, Adults)
- Below 18.5: Underweight
- 18.5–24.9: Normal / healthy weight
- 25.0–29.9: Overweight
- 30.0+: Obese
BMI Thresholds for Asian Populations
WHO recommends lower cut-offs for Asian adults, who tend to carry more visceral fat at lower BMIs:
- Overweight: ≥23.0
- Obese: ≥27.5
Does BMI Accuracy Change With Age?
As people age, muscle mass declines and fat mass increases even without weight change — a condition called "sarcopenic obesity." A 70-year-old with BMI 24 may have more fat and less muscle than a 30-year-old with the same BMI. Waist circumference and grip strength are better supplementary measures in older adults.
Waist-to-Height Ratio: A Simpler Alternative
Several recent large-scale studies have found waist-to-height ratio (WHtR = waist ÷ height) outperforms BMI in predicting cardiovascular events and diabetes:
- Healthy: WHtR <0.5 (waist less than half your height)
- Increased risk: 0.5–0.6
- High risk: >0.6
A 175 cm person → healthy waist below 87.5 cm.
The Practical Recommendation
Use BMI as a population-level screening tool, not as an individual verdict. Pair it with waist circumference, body fat percentage, blood pressure, and fasting glucose for a complete picture.
Calculate your BMI: Free BMI Calculator