Clinical Nutritionist CCN Clinical Nutritionist CCN MCQ 3

Question 1

A clinical nutritionist is counseling a breastfeeding woman who follows a strict vegan diet. Which nutrient supplementation is most critical for the infant's neurological development?

Accepted Answer

Vitamin B12

Answer

Breast milk from strict vegans is often deficient in vitamin B12, and infantile B12 deficiency causes severe, potentially irreversible neurological damage.

Question 2

Which type of dietary fiber is most effective at lowering LDL cholesterol through bile acid sequestration?

Accepted Answer

Soluble viscous fiber such as beta-glucan

Answer

Soluble viscous fibers like beta-glucan (found in oats and barley) bind bile acids in the gut, increasing their excretion and forcing the liver to use cholesterol to synthesize new bile acids.

Question 3

A male athlete reports muscle cramps, fatigue, and cardiac arrhythmias after intense training in heat. Which electrolyte imbalance is most likely?

Accepted Answer

Hypokalemia

Answer

Heavy sweat losses and inadequate potassium replacement lead to hypokalemia, which impairs neuromuscular function and can cause muscle cramps and cardiac arrhythmias.

Question 4

In nutrition assessment, which anthropometric measurement is most strongly associated with visceral adiposity and metabolic syndrome risk?

Accepted Answer

Waist circumference

Answer

Waist circumference directly reflects abdominal visceral fat accumulation, which is a stronger predictor of cardiometabolic risk than overall body weight or BMI alone.

Question 5

Which enzyme deficiency causes phenylketonuria (PKU), requiring lifelong dietary phenylalanine restriction?

Accepted Answer

Phenylalanine hydroxylase

Answer

PKU results from a deficiency of phenylalanine hydroxylase, which normally converts phenylalanine to tyrosine; accumulation of phenylalanine is neurotoxic.

Clinical Nutritionist CCN Practice Test

Clinical Nutritionist CCN Practice Test

Clinical Nutritionist CCN Clinical Nutritionist CCN MCQ 3