What is the primary purpose of Body Mass Index (B.M.I.)? Choose the best answer.

Question

BlackTom AI · Accepted Answer

BMI is calculated as weight in kilograms divided by height in meters squared (BMI = kg/m^2), so it is inherently a simple ratio that standardizes weight for height. For example: a person weighing 70 kg and 1.75 m tall has BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.0625 = 22.86. This illustrates why BMI is easy to compute and compare across large groups.

1) Relevant knowledge points and concepts
- BMI (Body Mass Index) is an anthropometric index developed by Adolphe Quetelet as a population-level tool.
- It is a proxy for relative weight, not a direct measurement of body composition or health.
- Epidemiology values simple, inexpensive, repeatable measures for comparing populations and tracking trends.

2) Step-by-step reasoning
- The formula shows BMI needs only weight and height—both easily and cheaply measured.
- Because it is quick and standardized, BMI is suitable for large-scale studies, surveillance, and risk stratification in populations.
- Its limitations (no differentiation between fat and lean mass, no information on fat distribution or metabolic health) make it unsuitable as a definitive individual diagnostic tool.

3) Intermediate calculation example (shown above) demonstrates simplicity: measure weight and height, square height, divide weight by squared height.

4) Why the correct answer is correct
- The statement “To provide a simple and cost-effective tool for epidemiological research” matches BMI’s intended and practical use: monitoring obesity prevalence, correlating BMI categories with disease risk across populations, and enabling public health comparisons.

5) Why other options are incorrect
- “To determine a person's true body composition.” Incorrect because BMI cannot distinguish fat vs. muscle or bone mass.
- “To accurately measure the percentage of body fat an individual possesses.” Incorrect; accurate body fat requires DEXA, hydrostatic weighing, or validated bioelectrical impedance/skin-fold methods.
- “To accurately measure an individual's health status.” Incorrect; health depends on many factors (metabolic markers, fitness, distribution of fat) that BMI does not capture.

6) Conclusion
The correct answer is “To provide a simple and cost-effective tool for epidemiological research,” which aligns with the provided answer.

What is the primary purpose of Body Mass Index (B.M.I.)? Choose the best answer.单项选择题

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