CNC CNC Weight Management & Body Composition 1 — Questions and Answers
Question 1: Which method is considered the gold standard for measuring body fat percentage in a clinical setting?
- Dual-energy X-ray absorptiometry (DEXA) (Correct answer)
- Bioelectrical impedance analysis (BIA)
- Skinfold calipers
- Body mass index (BMI)
Correct answer: Dual-energy X-ray absorptiometry (DEXA)
DEXA is considered the gold standard for body composition assessment because it provides accurate measurements of bone mineral density, lean mass, and fat mass.
Question 2: A certified nutrition coach is working with a client whose BMI is 31. According to standard classifications, this client falls into which category?
- Overweight
- Class I Obesity (Correct answer)
- Class II Obesity
- Normal weight
Correct answer: Class I Obesity
A BMI of 30–34.9 is classified as Class I (moderate) obesity according to standard WHO and CDC guidelines.
Question 3: What is the approximate caloric deficit per week required to lose one pound of body fat?
- 1,750 calories
- 3,500 calories (Correct answer)
- 5,000 calories
- 7,000 calories
Correct answer: 3,500 calories
One pound of adipose tissue contains approximately 3,500 calories, so a 3,500-calorie weekly deficit is the traditional estimate for one pound of fat loss.
Question 4: Which hormone, secreted by adipose tissue, signals satiety to the hypothalamus and decreases appetite?
- Ghrelin
- Cortisol
- Leptin (Correct answer)
- Insulin
Correct answer: Leptin
Leptin is an adipokine that communicates fat-store status to the brain, suppressing appetite when stores are sufficient.
Question 5: When calculating Total Daily Energy Expenditure (TDEE), which component typically accounts for the largest portion of calorie burn?
- Thermic effect of food (TEF)
- Exercise activity thermogenesis (EAT)
- Non-exercise activity thermogenesis (NEAT)
- Basal metabolic rate (BMR) (Correct answer)
Correct answer: Basal metabolic rate (BMR)
Basal metabolic rate typically represents 60–75% of TDEE, making it the single largest component of daily energy expenditure.
Question 6: A nutrition coach wants to estimate a sedentary female client's BMR using the Mifflin-St Jeor equation. Which variables are required?
- Age, height, weight, and sex (Correct answer)
- Age, height, weight, and activity level
- Weight, sex, and waist circumference
- Height, sex, and body fat percentage
Correct answer: Age, height, weight, and sex
The Mifflin-St Jeor equation uses age (years), height (cm), weight (kg), and sex to calculate BMR without requiring an activity multiplier.
