BMI is defined as:

BMI is defined as:

• A. A measure of body fat percentage
• B. A ratio of height to weight
• C. Estimate of optimal weight for optimal health
• D. A method to assess hydration status

Answer: (C)

BMI uses weight relative to height to gauge health risk associated with body mass. It’s calculated as weight in kilograms divided by height in meters squared (BMI = weight in kg / (height in m)²). This makes it a rough screening tool to categorize weight status (underweight, normal, overweight, obesity) and to identify potential health risk ranges, rather than a direct measure of body fat. It also isn’t a measure of hydration. Because of that, describing BMI as an estimate of the optimal weight for health best fits its purpose among the options. It’s not a direct fat measurement, not a simple height-to-weight ratio, and not a hydration assessment.

BMI uses weight relative to height to gauge health risk associated with body mass. It’s calculated as weight in kilograms divided by height in meters squared (BMI = weight in kg / (height in m)²). This makes it a rough screening tool to categorize weight status (underweight, normal, overweight, obesity) and to identify potential health risk ranges, rather than a direct measure of body fat. It also isn’t a measure of hydration.

Because of that, describing BMI as an estimate of the optimal weight for health best fits its purpose among the options. It’s not a direct fat measurement, not a simple height-to-weight ratio, and not a hydration assessment.