Body Mass Index (BMI) is a simple numerical value that relates your weight to your height to estimate body fat. Standard BMI categories: Underweight: < 18.5 Normal weight: 18.5 – 24.9 Overweight: 25 – 29.9 Obesity: ≥ 30

BMI is widely used because it is: Quick and simple (just height + weight) Low-cost (no equipment needed) Useful for screening potential weight-related health risks It helps identify increased risk for conditions like: Heart disease Type 2 diabetes High blood pressure

BMI is useful, but it’s not perfect. Key limitations: Doesn’t distinguish fat vs muscle A muscular athlete may be classified as “overweight” Ignores fat distribution Belly fat (more dangerous) isn’t specifically measured Doesn’t account for age, sex, or ethnicity well Body composition varies across populations Not ideal for certain groups Children, elderly, pregnant women, and athletes 👉 So BMI is a screening tool, not a diagnosis.

BMI is used in many practical settings: 1. Healthcare Initial screening for weight categories Identifying patients at risk of chronic diseases 2. Public health & research Tracking obesity trends in populations Comparing health data across countries 3. Fitness & wellness Rough benchmark for personal health goals Starting point before more detailed assessments 4. Insurance & policy Sometimes used in risk assessment models (though increasingly debated)