What did Dr. Hall's study find about the contestants' resting metabolic rates after six years?

Question

BlackTom AI · Accepted Answer

Resting metabolic rate (RMR) is the energy the body expends at rest to maintain basic physiological functions. Dr. Hall’s longitudinal follow-up measured contestants’ RMR at baseline (before the show), after rapid weight loss, and again six years later, comparing energy expenditure to body composition and weight.

1. Relevant knowledge points and concepts
- RMR is largely determined by lean body mass, hormonal status (thyroid, leptin), and sympathetic activity.
- “Metabolic adaptation” refers to a persistent reduction in RMR below what would be predicted from body composition after weight loss.
- Long-term follow-up can reveal whether this adaptation reverses when weight is regained.

2. Step-by-step reasoning based on the study design and findings
- Contestants underwent substantial weight loss during the show; RMR dropped acutely, as expected.
- Six-year follow-up re-measured RMR and body weight/composition.
- Although many contestants regained weight over the six years, their measured RMR remained lower than expected for their current body composition and compared to their pre-show values.
- This indicates a persistent metabolic adaptation rather than a transient effect that reversed with weight regain.

3. Calculations
- The study compared measured RMR to predicted RMR based on lean mass; the persistent negative difference indicated depressed RMR. (No numerical calculations are provided here, but the comparison method is standard.)

4. Why the correct answer is correct
- The empirical result reported by Dr. Hall was that RMR stayed depressed despite participants regaining weight, showing that the metabolic adaptation persisted long-term.

5. Why the other options are incorrect
- “They increased significantly”: contradicts the measured persistent suppression.
- “They remained the same as before the show”: would imply no lasting adaptation; the study found a sustained decrease.
- “They varied widely without a clear pattern”: the study reported a consistent depressed RMR rather than random variability.

6. Conclusion
- Therefore, the correct conclusion is: They stayed depressed despite weight regain. This matches the provided answer.

What did Dr. Hall's study find about the contestants' resting metabolic rates after six years?单项选择题

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