According to the new analysis of "The Biggest Loser," what misconception does it challenge about extreme weight loss?

Question

BlackTom AI · Accepted Answer

Extreme calorie restriction combined with intense exercise does not guarantee permanent weight loss because the body adapts to defend a higher weight set point.

1. Relevant knowledge points and concepts
- Energy balance: weight change equals energy intake minus energy expenditure.
- Resting metabolic rate (RMR): the energy the body uses at rest; a major component of total daily energy expenditure.
- Metabolic adaptation (adaptive thermogenesis): a downshift in RMR that exceeds what is expected from the loss of body mass, making maintenance of lower weight harder.
- Long-term follow-up studies of rapid/extreme weight loss (such as contestants on The Biggest Loser) show persistent reductions in RMR and high rates of weight regain.

2. Step-by-step reasoning
- Contestants underwent extreme calorie restriction and very high physical activity, causing rapid and large weight loss initially.
- According to energy-balance principles, RMR typically declines with loss of body mass because a smaller body needs less energy.
- The new analysis found RMR fell more than predicted (adaptive thermogenesis). This greater-than-expected decrease in metabolic rate lowers daily energy needs.
- With a lower RMR, the same food intake and activity level that maintained weight before weight loss now produce a calorie surplus, promoting regain.
- Because the metabolic suppression persisted long-term, the initial extreme intervention did not produce durable weight loss.

3. Calculations
- No numerical calculation is required here. The key quantitative finding is that the observed decline in RMR exceeded the decline expected from reduced mass—the analysis compared measured RMR to predicted values and found a sustained deficit.

4. Why the correct answer is correct
- The correct answer states that extreme exercise and calorie restriction leads to permanent weight loss. The study challenges this: despite large initial losses, physiological adaptations (lowered RMR) made long-term maintenance unlikely, showing the premise of permanence is false.

5. Why the other options are incorrect
- "Resting metabolic rates increase with weight loss": incorrect — RMR decreases, often more than expected.
- "Diet alone is sufficient for long-term weight loss": incorrect — the analysis shows biological adaptations undermine simple diet-only approaches.
- "Metabolic rates do not change significantly with weight loss": incorrect — they do change significantly (decline and can remain suppressed).

6. Conclusion
The new analysis challenges the idea that extreme exercise and calorie restriction produce permanent weight loss. This confirms the provided answer: "Extreme exercise and calorie restriction leads to permanent weight loss" is the misconception the study challenges.

According to the new analysis of "The Biggest Loser," what misconception does it challenge about extreme weight loss?单项选择题

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