Fat Burning Fundamentals and Core Concepts 5

Question 1

What is 'fat flux,' and why is it important for understanding body fat change?

Accepted Answer

The dynamic balance between the rate of fat storage and fat oxidation over time

Answer

Fat flux describes the continuous flow of fatty acids in and out of adipose tissue; net fat loss occurs only when oxidation persistently exceeds storage over time.

Question 2

Which of the following best explains why fasted cardio may increase fat oxidation during the session but does not necessarily produce greater fat loss over 24 hours?

Accepted Answer

Total daily energy balance and substrate use over 24 hours, not just during exercise, determine net fat loss

Answer

While fasted exercise shifts fuel use toward fat during the session, compensatory eating or reduced activity later can erase any extra fat-oxidation advantage within the full 24-hour window.

Question 3

What is the approximate caloric density of one gram of pure fat compared to one gram of carbohydrate?

Accepted Answer

9 kcal/g fat vs. 4 kcal/g carbohydrate

Answer

Fat contains 9 kcal per gram because its highly reduced carbon bonds store more energy, while carbohydrates and proteins each yield approximately 4 kcal per gram.

Question 4

How does chronic high cortisol (as seen in prolonged stress) specifically impair fat loss?

Accepted Answer

Cortisol promotes visceral fat deposition, increases appetite, and breaks down muscle, lowering metabolic rate

Answer

Elevated cortisol drives fat redistribution to visceral depots, raises hunger and cravings for calorie-dense foods, and catabolizes muscle, reducing the resting metabolic rate.

Question 5

Which statement accurately describes the role of mitochondrial density in fat burning capacity?

Accepted Answer

Greater mitochondrial density increases the cell's capacity to oxidize fatty acids because beta-oxidation occurs inside mitochondria

Answer

Since beta-oxidation and the Krebs cycle both occur in mitochondria, cells with more and larger mitochondria can oxidize fat at a higher rate, which is a key adaptation to endurance training.

Fat Burning Practice Test

Fat Burning Practice Test

Fat Burning Fundamentals and Core Concepts 5