Fat Burning Ultimate 2 — Questions and Answers
Question 1: Which hormone is most directly responsible for signaling fat cells to release stored fatty acids during exercise?
- Insulin
- Epinephrine (Correct answer)
- Cortisol
- Leptin
Correct answer: Epinephrine
Epinephrine (adrenaline) binds to receptors on fat cells and activates lipolysis, releasing stored fatty acids into the bloodstream.
Question 2: What is the primary fuel source used by the body during low-intensity, steady-state exercise (below 60% VO2 max)?
- Muscle glycogen
- Blood glucose
- Fat (fatty acids) (Correct answer)
- Lactate
Correct answer: Fat (fatty acids)
At low intensities the oxidative system predominates and fat provides the majority of energy because oxygen supply is sufficient to fully oxidize fatty acids.
Question 3: Which dietary approach has been shown to increase fat oxidation at rest by depleting liver and muscle glycogen?
- High-carbohydrate loading
- Ketogenic diet (Correct answer)
- Intermittent fasting (16:8)
- High-protein diet
Correct answer: Ketogenic diet
A ketogenic diet severely restricts carbohydrates, forcing the body to upregulate fat oxidation enzymes and rely on fatty acids and ketones for fuel.
Question 4: A person burns 500 kcal during a 45-minute jog. Roughly how many grams of pure fat does this represent?
- 27 g
- 56 g (Correct answer)
- 78 g
- 111 g
Correct answer: 56 g
Fat provides approximately 9 kcal per gram, so 500 kcal ÷ 9 kcal/g ≈ 56 g of pure fat.
Question 5: Which enzyme inside fat cells (adipocytes) is the rate-limiting step of lipolysis?
- Hormone-sensitive lipase (HSL) (Correct answer)
- Lipoprotein lipase (LPL)
- Fatty acid synthase
- Acetyl-CoA carboxylase
Correct answer: Hormone-sensitive lipase (HSL)
Hormone-sensitive lipase is activated by catecholamines and inhibited by insulin; it hydrolyzes stored triglycerides into glycerol and free fatty acids.
Question 6: High-intensity interval training (HIIT) promotes fat loss primarily through which post-exercise mechanism?
- Increased glycogen storage
- Elevated excess post-exercise oxygen consumption (EPOC) (Correct answer)
- Reduced cortisol levels
- Suppressed appetite hormones
Correct answer: Elevated excess post-exercise oxygen consumption (EPOC)
HIIT creates a significant oxygen debt that must be repaid after exercise, keeping metabolic rate elevated and fat oxidation higher for hours post-workout.
Question 7: Which of the following best describes the 'fat-burning zone' concept?
- The intensity where the highest absolute amount of fat is burned
- The intensity where fat provides the highest percentage of fuel (Correct answer)
- Any exercise above 80% max heart rate
- Exercise performed only in a fasted state
Correct answer: The intensity where fat provides the highest percentage of fuel
The fat-burning zone refers to the intensity (typically 60–70% max HR) where fat contributes the greatest percentage of energy, though total calorie burn is lower than at higher intensities.
Fat Burning Ultimate 2
Which hormone is most directly responsible for signaling fat cells to release stored fatty acids during exercise?