A history of weight loss reduces metabolic rate.

Question

BlackTom AI · Accepted Answer

A history of weight loss reduces metabolic rate—True, because weight loss produces both predictable declines in energy needs (from having less mass) and additional “adaptive” reductions in resting and total energy expenditure.

1) Relevant knowledge points and concepts
- Resting metabolic rate (RMR) is largely determined by body mass, especially lean body mass (muscle and high-metabolic-rate organs).
- Energy expenditure has components: RMR, thermic effect of food, and activity energy expenditure (including NEAT).
- Weight loss reduces all these components by reducing body mass and intake.
- Adaptive thermogenesis: hormonal and autonomic changes (lower leptin, reduced thyroid activity, lower sympathetic output) lower RMR beyond what is expected from mass loss alone.

2) Step-by-step reasoning
- When someone loses weight, they lose fat and usually some lean mass. Loss of lean mass directly lowers RMR because muscle and organs consume more energy at rest than fat.
- Caloric intake falls during and after weight loss; the thermic effect of food decreases proportionally.
- Hormonal shifts after weight loss (reduced leptin, changes in thyroid hormones and catecholamines) reduce metabolic rate further — this is adaptive thermogenesis.
- Repeated or significant past weight loss episodes can leave the metabolism still suppressed compared with a never-dieted person of the same weight.

3) Example calculation (illustrative)
- If baseline RMR = 1,800 kcal/day and a person loses 10% body weight, expected RMR fall from reduced mass might be ~100–200 kcal/day. Adaptive thermogenesis can add an extra ~50–150 kcal/day reduction, yielding a net RMR reduction of ~150–350 kcal/day compared with baseline.

4) Why the correct answer is correct
- Empirical studies show that after weight loss RMR is lower than predicted by body composition alone, and people with prior weight loss history tend to have lower metabolic rates relative to body size.

5) Why the other option is incorrect
- The “False” choice ignores the well-documented effects of lean mass loss and adaptive thermogenesis; it wrongly assumes RMR returns to a pre-weight-loss baseline.

6) Conclusion
- Therefore the statement is True, matching the provided answer.

A history of weight loss reduces metabolic rate.True/False

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