What physiological reason did experts suggest for why morning exercise might be more effective for weight loss?

Question

BlackTom AI · Accepted Answer

Morning exercise can preferentially use stored fat for energy because an overnight fast lowers circulating insulin and muscle/liver glycogen, shifting the body toward increased lipolysis and fatty-acid oxidation.

1. Relevant knowledge points and concepts
- Overnight fasting state reduces blood glucose and insulin levels; low insulin disinhibits hormone-sensitive lipase in adipose tissue, increasing lipolysis (release of free fatty acids).
- During low-to-moderate intensity exercise, muscles can use both carbohydrate (glycogen/glucose) and fat (free fatty acids) for ATP production; substrate use depends on availability and hormonal milieu.
- Catecholamines (epinephrine/norepinephrine) released with exercise augment lipolysis and fat mobilization.
- Long-term weight loss depends on net energy balance, but acute increases in fat oxidation during exercise can contribute to greater fat loss over time if calories are controlled.

2. Step-by-step reasoning
- Overnight fasting → lower insulin and partially depleted glycogen stores.
- Lower insulin and higher sensitivity to catecholamines → increased activity of hormone-sensitive lipase → adipose tissue releases more free fatty acids.
- Beginning exercise in this state means muscle uptake of circulating free fatty acids is relatively greater compared with fed-state exercise, so a higher proportion of energy is derived from stored fat.
- Repeated sessions that preferentially oxidize fat can support reductions in fat mass when overall calorie intake does not offset expenditure.

3. Calculations
- No numerical calculation is required here; the explanation is physiological and mechanistic.

4. Why the correct answer is correct
- "Reliance on stored fat for energy during morning exercise" directly captures the physiological chain: fasting state, increased lipolysis, and greater fat oxidation during morning workouts — the mechanism experts cited as making morning exercise potentially more effective for weight loss.

5. Why the other options are incorrect
- "More social support for morning exercisers": social factors may affect adherence but are not the physiological reason experts suggested.
- "Increased metabolism in the morning": resting metabolic rate is not substantially higher in the morning in a way that explains greater fat loss; substrate selection, not basal metabolic rate, is key.
- "Better mood regulation after morning exercise": improved mood can help adherence but is not the physiological substrate-shift explanation experts proposed.

6. Conclusion
The physiological reason experts suggested is that morning exercise relies more on stored fat for energy, which matches the provided correct answer.

What physiological reason did experts suggest for why morning exercise might be more effective for weight loss?单项选择题

类似问题

In the fasted state the respiratory exchange ratio is close to 0.7. Taking into account which macronutrients can be stored, which macronutrient is providing most of the energy for cellular metabolism in the fasted state?

What is the molecular basis of the statement “fats burn in the flame of carbohydrates”

A consistent low-carbohydrate diet will lead to a greater reliance on fat as a source of fuel during exercise.

Which macronutrient provides most of the energy required for low-intensity activities and rest?

A majority of the working dog's energy is derived from __________ metabolism.

Question 30 Choose a, b, c or d as the best answer. The author’s main argument is that the 100:80:100 model __________.

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单