How does regular endurance exercise contribute to better control of body fat?

Question

BlackTom AI · Accepted Answer

Regular endurance exercise increases daily calorie expenditure because sustained aerobic activity raises the amount of energy the body uses both during the session and, to a lesser extent, afterward.

1) Relevant concepts:
- Total Daily Energy Expenditure (TDEE) = basal metabolic rate + thermic effect of food + activity energy expenditure. Endurance exercise raises the activity component of TDEE.
- Energy balance principle: body fat changes when energy intake differs from energy expenditure.
- Exercise also improves substrate use (greater fat oxidation) and insulin sensitivity, aiding fat control.

2) Step-by-step reasoning:
- During a bout of endurance exercise (e.g., jogging, cycling, swimming), working muscles require ATP, so the body increases caloric burn to supply that ATP.
- Repeated sessions add up: more calories burned across days/weeks increases total energy expenditure.
- If caloric intake remains constant, the increased expenditure creates a negative energy balance, forcing the body to mobilize stored fat for energy.
- Improved metabolic adaptations (higher mitochondrial density, enhanced fat oxidation) support greater reliance on fat during and after exercise.

3) Calculation example (intermediate steps shown):
- Suppose one 30-minute moderate run burns ~300 kcal.
- Doing that 5 times/week: 300 kcal × 5 = 1,500 kcal/week extra expenditure.
- One pound of fat ≈ 3,500 kcal, so 1,500/3,500 ≈ 0.43 lb fat loss per week from exercise alone, all else equal.

4) Why the correct answer is correct:
- “It increases daily calorie expenditure” directly describes the mechanism by which endurance training helps control body fat: increasing TDEE and creating an energy deficit.

5) Why other options are incorrect:
- “It decreases calorie requirements” contradicts reality (exercise increases, not decreases, energy needs).
- “It decreases daily energy expenditure” is opposite of the true effect.
- “It increases calorie intake” may sometimes occur (increased appetite), but that is not how endurance exercise controls body fat and would counteract fat loss.

Conclusion: The correct answer is “It increases daily calorie expenditure.” This matches the provided answer.

How does regular endurance exercise contribute to better control of body fat?Single choice

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