Body mass index

Definition

Body Mass Index (BMI) is a numerical value derived from an individual's weight and height, providing a rough estimate of body fat. It is commonly used to classify underweight, normal weight, overweight, and obesity in adults.

5 Must Know Facts For Your Next Test

1. BMI is calculated using the formula: weight (kg) / height (m)^2.
2. A BMI of less than 18.5 indicates underweight; 18.5-24.9 is normal; 25-29.9 is overweight; and 30 or above is considered obese.
3. BMI does not directly measure body fat but correlates with more direct measures of body fat.
4. Factors such as muscle mass, bone density, and overall body composition can affect the accuracy of BMI.
5. Healthcare professionals use BMI as a screening tool but not as a diagnostic measure for health.

Review Questions

• What formula is used to calculate Body Mass Index?
• How is BMI categorized in terms of weight status?
• Why might BMI be an inaccurate measure for certain individuals?

Related terms

Basal Metabolic Rate (BMR): The number of calories required to keep your body functioning at rest.

Waist-to-Hip Ratio: A measurement that compares the size of your waist to your hips and helps assess fat distribution.

Adiposity: The condition of being severely overweight or having an excessive amount of body fat.