World Health Organization (WHO) BMI Classification
| Category | BMI Range ($kg/m^2$) | Health Risk Level |
|---|---|---|
| Underweight | < 18.5 | Increased risk of nutritional deficiency |
| Normal Weight | 18.5 – 24.9 | Lowest overall risk |
| Overweight | 25.0 – 29.9 | Moderate risk |
| Obesity Class I | 30.0 – 34.9 | High risk |
| Obesity Class II & III | ≥ 35.0 | Very High to Severe risk |