For health sake, a person with a BMI of 20 might want to:

Question

BlackTom AI · Accepted Answer

A BMI of 20 falls within the normal weight category defined for adults, so maintaining current weight is the appropriate recommendation.

1. Relevant knowledge points and concepts
- Body Mass Index (BMI) categories for adults: underweight < 18.5, normal 18.5–24.9, overweight 25.0–29.9, obese ≥ 30.0.
- Health guidance: people with BMI in the normal range are generally advised to maintain a healthy weight through balanced diet and regular physical activity rather than deliberately losing or gaining weight.

2. Complete reasoning process step by step
- The given BMI is 20.
- Compare 20 to the BMI thresholds: 18.5 ≤ 20 ≤ 24.9.
- Because 20 lies squarely inside the normal range, no corrective weight change is medically indicated solely on the basis of BMI.

3. Calculations and intermediate steps
- Check lower bound: 20 − 18.5 = 1.5 (above underweight threshold).
- Check upper bound: 24.9 − 20 = 4.9 (below overweight threshold).
- Both checks confirm BMI 20 is within the normal interval 18.5–24.9.

4. Why the correct answer is correct
- “Maintain weight” is appropriate because a BMI of 20 indicates healthy body weight relative to height. The goal should be to preserve that healthy status through stable calorie balance and healthy lifestyle habits.

5. Why the other options are incorrect
- a. lose weight: Incorrect because weight loss is recommended when BMI is in the overweight/obese ranges (≥ 25), not for BMI 20.
- c. gain weight: Incorrect because weight gain is recommended only for underweight individuals (BMI < 18.5), not for BMI 20.
- d. stay the same weight: Semantically this is essentially the same as “maintain weight.” If forced to choose, b (“maintain weight”) is the intended concise correct option; d is a redundant phrasing.

6. Conclusion
- The correct choice is maintain weight (option b), which matches the provided answer.

For health sake, a person with a BMI of 20 might want to:单项选择题

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