According to standards issued by the National Institutes of Health (NIH) and the World Health Organization (WHO), a normal BMI is between

Question

BlackTom AI · Accepted Answer

BMI of 18.5–24.9 is classified as the normal (healthy weight) range by NIH and WHO.

1) Relevant knowledge points and concepts
- Body Mass Index (BMI) is a screening measure defined as weight in kilograms divided by height in meters squared: BMI = weight (kg) / [height (m)]^2.
- Standard adult BMI categories per NIH/WHO: underweight < 18.5; normal (healthy) 18.5–24.9; overweight 25.0–29.9; obesity ≥ 30.0.

2) Complete reasoning process step by step
- Compare each answer option to the standardized category boundaries above.
- Identify which option matches the NIH/WHO "normal" interval 18.5–24.9.

3) Example calculation (intermediate steps shown)
- For a person weighing 70 kg and 1.75 m tall:
  - Compute height squared: 1.75 × 1.75 = 3.0625.
  - Compute BMI: 70 ÷ 3.0625 = 22.857... ≈ 22.86.
- 22.86 lies between 18.5 and 24.9, so this person is in the normal BMI range, illustrating the classification.

4) Why the correct answer is correct
- The option "18.5 and 24.9" exactly matches the widely used WHO/NIH adult classification for a normal (healthy) BMI range. This is the authoritative definition used in clinical and public-health guidance.

5) Why the other options are incorrect
- "12.5 and 15.4" and "15.5 and 18.4" are both below 18.5 and therefore fall into underweight categories, not normal.
- "25 and 27.5" begins at 25.0, which is the threshold for overweight (not normal); values in that interval are classified as overweight.

6) Conclusion
- The correct answer is "18.5 and 24.9," which matches the provided authoritative answer.

According to standards issued by the National Institutes of Health (NIH) and the World Health Organization (WHO), a normal BMI is between单项选择题

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