Weight Loss Weight Loss Metabolism 1 — Questions and Answers
Question 1: What does 'Basal Metabolic Rate' (BMR) represent in the context of weight management?
- Calories burned during exercise only
- The minimum calories needed to sustain basic body functions at rest (Correct answer)
- The maximum caloric intake for weight loss
- Daily caloric needs including all activity
Correct answer: The minimum calories needed to sustain basic body functions at rest
BMR is the number of calories the body requires to maintain vital functions (breathing, circulation, cell production) at complete rest, comprising about 60–70% of total daily energy expenditure.
Question 2: Which factor has the greatest influence on an individual's basal metabolic rate?
- Hair color
- Lean muscle mass (Correct answer)
- Height alone
- Blood type
Correct answer: Lean muscle mass
Lean muscle mass is the strongest determinant of BMR because muscle tissue is metabolically active and burns significantly more calories at rest than fat tissue.
Question 3: What is the thermic effect of food (TEF) and approximately what percentage of daily caloric expenditure does it represent?
- The heat from cooking food; 40%
- The energy used to digest, absorb, and metabolize food; approximately 10% (Correct answer)
- Calories burned from hot beverages; 5%
- The fat-burning effect of spicy foods; 25%
Correct answer: The energy used to digest, absorb, and metabolize food; approximately 10%
TEF is the energy expenditure associated with digesting and processing food, accounting for approximately 10% of total daily energy expenditure, with protein having the highest TEF at 20–30%.
Question 4: How does aging affect metabolism and body composition in ways relevant to weight management?
- Metabolism speeds up significantly after age 40
- Metabolism slows and muscle mass declines naturally after age 30–40, reducing BMR (Correct answer)
- Age has no effect on metabolism or weight management
- Older adults burn more fat at rest than younger adults
Correct answer: Metabolism slows and muscle mass declines naturally after age 30–40, reducing BMR
Age-related sarcopenia (muscle loss) reduces lean body mass, lowering BMR and making it progressively easier to gain weight and harder to lose it without deliberate resistance training.
Question 5: What is the difference between 'fat loss' and 'weight loss' and why is the distinction important?
- They are identical with no meaningful difference
- Weight loss includes loss of muscle and water, while fat loss specifically targets adipose tissue (Correct answer)
- Fat loss always occurs before muscle loss
- Weight loss always equals fat loss in caloric deficit
Correct answer: Weight loss includes loss of muscle and water, while fat loss specifically targets adipose tissue
Weight loss reflects total mass reduction including muscle, water, and fat, while fat loss specifically targets adipose tissue; preserving muscle during a deficit is critical for metabolic health.
Question 6: Which hormone produced by the pancreas plays a central role in regulating fat storage and is elevated in response to carbohydrate-rich meals?
- Glucagon
- Insulin (Correct answer)
- Cortisol
- Testosterone
Correct answer: Insulin
Insulin is released in response to blood glucose rises and signals fat cells to store fatty acids; chronically elevated insulin from high-carb diets promotes fat accumulation and inhibits fat breakdown.
Weight Loss Weight Loss Metabolism 1
What does 'Basal Metabolic Rate' (BMR) represent in the context of weight management?