Fat Burning Metabolism and Energy Systems 3

Question 1

Which macronutrient has the highest thermic effect of food (TEF), meaning the body burns the most calories digesting it?

Accepted Answer

Protein (20–30% TEF)

Answer

Protein has the highest thermic effect of food at 20–30%, meaning the body expends significantly more energy breaking down and absorbing protein compared to fats or carbohydrates.

Question 2

What is the primary role of carnitine in fat metabolism?

Accepted Answer

Transporting long-chain fatty acids across the inner mitochondrial membrane for beta-oxidation

Answer

Carnitine acts as a shuttle molecule, transporting long-chain fatty acids across the inner mitochondrial membrane so they can undergo beta-oxidation to produce ATP.

Question 3

How does chronic sleep deprivation most directly impair fat loss?

Accepted Answer

It elevates cortisol and ghrelin, promoting fat storage and increased appetite

Answer

Sleep deprivation raises cortisol (promoting fat storage) and ghrelin (the hunger hormone) while lowering leptin, creating a hormonal environment that drives overeating and impairs fat metabolism.

Question 4

What is the primary metabolic function of brown adipose tissue (BAT)?

Accepted Answer

Generating heat by burning calories through thermogenesis

Answer

Brown adipose tissue is packed with mitochondria and generates heat through non-shivering thermogenesis, actively burning calories and making it metabolically beneficial for fat loss.

Question 5

How does consistent strength training enhance long-term fat burning?

Accepted Answer

It increases muscle mass, raising BMR and improving resting fat oxidation

Answer

Strength training builds metabolically active skeletal muscle, which raises basal metabolic rate so the body burns more calories at rest, supporting sustained fat loss over time.

Fat Burning Practice Test

Fat Burning Practice Test

Fat Burning Metabolism and Energy Systems 3