Question at position 11 With diet-induced weight loss, what happens to resting metabolic rate (RMR) or basal metabolic rate (BMR) over time?RMR or BMR increasesRMR or BMR decreasesRMR or BMR stays the same单项选择题
A
RMR or BMR increases
B
RMR or BMR decreases
C
RMR or BMR stays the same

Question

Question at position 11 With diet-induced weight loss, what happens to resting metabolic rate (RMR) or basal metabolic rate (BMR) over time?RMR or BMR increasesRMR or BMR decreasesRMR or BMR stays the same单项选择题

A

RMR or BMR increases

B

RMR or BMR decreases

C

RMR or BMR stays the same

BlackTom AI · Accepted Answer

Diet-induced weight loss causes a decrease in resting metabolic rate (RMR) and basal metabolic rate (BMR) because both the amount of metabolically active tissue falls and compensatory physiological adaptations reduce energy expenditure.

1) Relevant knowledge points and concepts
- RMR/BMR: energy required for basic physiological functions at rest; largely determined by lean body mass (organs, muscle) and hormonal status.
- Energy balance: calorie deficit forces the body to catabolize fat and some lean tissue.
- Adaptive thermogenesis (metabolic adaptation): neuroendocrine changes (lowered leptin, thyroid hormones, sympathetic activity) reduce energy expenditure beyond what mass loss alone predicts.
- Time course: these effects develop over weeks to months during sustained dieting.

2) Step-by-step reasoning process
- Calorie deficit → body uses stored energy → loss of fat and some lean mass.
- Less lean mass → fewer cells requiring energy → direct reduction in RMR/BMR.
- Simultaneously, hormonal/signaling changes decrease cellular metabolic activity (adaptive thermogenesis) → further reduction in RMR/BMR.
- Behavioral and autonomic changes (reduced NEAT, lower sympathetic tone) compound the decline in total daily energy expenditure.

3) Intermediate logical steps (illustrative calculation)
- Example: baseline RMR = 1600 kcal/day. If dieting causes loss of lean mass and size such that expected RMR drop from reduced mass = 80 kcal/day, and adaptive thermogenesis contributes an extra 40 kcal/day reduction, total RMR decrease ≈ 120 kcal/day. This shows both mass loss and metabolic adaptation combine to lower RMR.

4) Why the correct answer is correct
- Empirical studies consistently show RMR/BMR falls during weight loss, often more than predicted by body composition change alone due to adaptive thermogenesis. Therefore “RMR or BMR decreases” is the correct choice.

5) Why the other options are incorrect
- “RMR or BMR increases”: inconsistent with physiology; energy deficit and tissue loss do not raise basal energy needs.
- “RMR or BMR stays the same”: contradicted by measured decreases; the body’s mass and hormonal milieu change, so RMR/BMR does not remain static.

6) Conclusion
- The correct answer is “RMR or BMR decreases,” which matches the provided answer and is supported by loss of metabolically active mass plus adaptive metabolic downregulation.

Question at position 11 With diet-induced weight loss, what happens to resting metabolic rate (RMR) or basal metabolic rate (BMR) over time?RMR or BMR increasesRMR or BMR decreasesRMR or BMR stays the same单项选择题

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Question at position 6 An increase in ambient temperature will have what effect on energy metabolism?no effectincreasedecreasenot enough information

The M in the abbreviation BMR stands for:

Resting metabolic rate

Due to a decreased metabolic rate in geriatric cats, energy requirements can decrease by as much as:

Taller people need proportionately more energy than shorter people to balance their energy budgets.

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Question at position 11 With diet-induced weight loss, what happens to resting metabolic rate (RMR) or basal metabolic rate (BMR) over time?RMR or BMR increasesRMR or BMR decreasesRMR or BMR stays the same单项选择题

类似问题

Question at position 2 The main contributor to daily energy expenditure for the average person is the:thermic effect of physical activitythermic effect of a mealresting metabolic ratenone of the aboveClear my selection

Question at position 7 Which of the following is a well-established metabolic adaptation to negative energy balance?build muscledecrease resting metabolismpreserve muscle massincrease appetite

Question at position 2 Which of the following may have the highest metabolic rate per unit mass?FatHeartMuscleBone

Question at position 6 An increase in ambient temperature will have what effect on energy metabolism?no effectincreasedecreasenot enough information

The M in the abbreviation BMR stands for:

Resting metabolic rate

Due to a decreased metabolic rate in geriatric cats, energy requirements can decrease by as much as:

Taller people need proportionately more energy than shorter people to balance their energy budgets.​

更多留学生实用工具

希望你的学习变得更简单

Taller people need proportionately more energy than shorter people to balance their energy budgets.