Clinical Nutritionist CCN Clinical Nutritionist CCN MCQ 5 — Questions and Answers
Question 1: A clinical nutritionist reviews labs for a 65-year-old woman: low serum 25-OH vitamin D (18 ng/mL), elevated PTH, and normal calcium. What is the most appropriate initial intervention?
- Prescribe calcitriol (active vitamin D)
- Recommend vitamin D3 supplementation and increased calcium intake (Correct answer)
- Restrict phosphorus in the diet
- Order a bone density scan before any intervention
Correct answer: Recommend vitamin D3 supplementation and increased calcium intake
Secondary hyperparathyroidism due to vitamin D insufficiency is corrected primarily by repleting vitamin D3 and ensuring adequate calcium intake to normalize PTH.
Question 2: Which amino acid is classified as conditionally essential during periods of physiological stress such as surgery, sepsis, or trauma?
- Leucine
- Glutamine (Correct answer)
- Alanine
- Glycine
Correct answer: Glutamine
Glutamine becomes conditionally essential under catabolic stress because demand exceeds synthesis capacity; it supports intestinal integrity and immune cell fuel.
Question 3: In nutrition epidemiology, what is the primary limitation of a food frequency questionnaire (FFQ) compared to a 24-hour dietary recall?
- FFQs cannot assess micronutrient intake
- FFQs rely on long-term memory and may have greater recall bias (Correct answer)
- FFQs are more expensive to administer
- FFQs cannot be used for large epidemiological studies
Correct answer: FFQs rely on long-term memory and may have greater recall bias
FFQs require participants to recall and estimate habitual dietary patterns over weeks or months, introducing substantial recall and estimation bias compared to the shorter recall period of a 24-hour recall.
Question 4: A client presents with a goiter, fatigue, weight gain, and cold intolerance. Her diet is very high in raw cruciferous vegetables. Which dietary component is most likely contributing?
- Phytates blocking mineral absorption
- Glucosinolates acting as goitrogens (Correct answer)
- Oxalates inhibiting iodine uptake
- Tannins reducing thyroid hormone synthesis
Correct answer: Glucosinolates acting as goitrogens
Glucosinolates in raw cruciferous vegetables are hydrolyzed to goitrin and isothiocyanates, which inhibit thyroid peroxidase and iodine organification, potentially causing goiter.
Question 5: Which macronutrient has the highest thermic effect of food (TEF), meaning the greatest percentage of its calories are used in digestion and metabolism?
- Fat
- Carbohydrate
- Protein (Correct answer)
- Alcohol
Correct answer: Protein
Protein has a TEF of approximately 20–30%, meaning up to 30% of its caloric value is expended during digestion, absorption, and metabolism — far higher than fat (0–3%) or carbohydrate (5–10%).
Question 6: A client with gout is asking about dietary modifications. Which food should be most restricted?
- Low-fat dairy products
- Organ meats such as liver and kidney (Correct answer)
- Whole grain bread
- Leafy green vegetables
Correct answer: Organ meats such as liver and kidney
Organ meats have extremely high purine content, which is metabolized to uric acid; reducing organ meat intake is one of the most impactful dietary changes for gout management.
Question 7: According to the Acceptable Macronutrient Distribution Ranges (AMDR) for adults, what percentage of total daily calories should come from fat?
- 10–15%
- 20–35% (Correct answer)
- 35–45%
- 45–65%
Correct answer: 20–35%
The AMDR for fat in adults is 20–35% of total energy intake, as established by the Dietary Reference Intakes to support essential fatty acid needs while limiting cardiovascular risk.
Clinical Nutritionist CCN Clinical Nutritionist CCN MCQ 5
A clinical nutritionist reviews labs for a 65-year-old woman: low serum 25-OH vitamin D (18 ng/mL), elevated PTH, and normal calcium.
What is the most appropriate initial intervention?