How is Body Mass Index (BMI) calculated?

Body Mass Index (BMI) is a numerical value derived from a person's weight and height, providing a simple and widely used method to assess body composition and categorize individuals as underweight, normal weight, overweight, or obese. The formula for calculating BMI is weight in kilograms divided by height in meters squared (kg/m²). This approach allows for a standardized assessment of body weight relative to height, offering insights into potential health risks associated with overweight and obesity.

The other options highlight different aspects of health assessment but do not pertain to BMI calculation. Measuring blood pressure and heart rate is related to cardiovascular health. Assessing dietary habits focuses on nutrition and eating patterns, while evaluating physical activity levels pertains to fitness and exercise, none of which directly calculate BMI. Thus, the correct answer clearly identifies BMI as a measurement based on the comparison of weight to height.