In assessing weight-related health risk, the body mass index (BMI) is used mainly to:

• A. Directly measure percent body fat and fat distribution
• B. Diagnose metabolic syndrome without considering other clinical measures
• C. Determine daily calorie needs with high precision for individuals
• D. Estimate weight status and associated health risk by relating body weight to height

Answer: (D)

Verified step by step guidance

1. Understand that Body Mass Index (BMI) is a numerical value calculated from a person's weight and height, used as a screening tool to categorize weight status.
2. Recall the formula for BMI: \(BMI = \frac{weight\ (kg)}{height\ (m)^2}\), which relates body weight to height squared.
3. Recognize that BMI does not directly measure body fat percentage or fat distribution, but provides an estimate of weight status (underweight, normal, overweight, or obese).
4. Know that BMI alone cannot diagnose metabolic syndrome or precisely determine daily calorie needs, as these require additional clinical assessments and individual factors.
5. Conclude that the primary use of BMI is to estimate weight status and associated health risks by relating body weight to height, serving as a useful initial screening tool in health assessments.