Clinical Nutritionist CCN Nutritional Biochemistry and Supplementation 2

Question 1

Which form of magnesium is most often used clinically for its muscle-relaxing and sleep-supporting properties?

Accepted Answer

Magnesium glycinate

Answer

Magnesium glycinate is chelated to glycine, an inhibitory neurotransmitter, producing calming effects that support sleep and muscle relaxation with minimal laxative side effects.

Question 2

What is the mechanism by which probiotics improve intestinal barrier function in clinical nutrition?

Accepted Answer

Upregulating tight junction protein expression (occludin, claudin) and reducing intestinal permeability

Answer

Probiotic strains stimulate expression of tight junction proteins that seal paracellular spaces, reducing 'leaky gut,' modulating immune responses, and decreasing translocation of harmful bacteria.

Question 3

Berberine is a plant alkaloid used as a nutraceutical that exerts metabolic effects through which primary mechanism?

Accepted Answer

Activation of AMP-activated protein kinase (AMPK), improving insulin sensitivity and lipid metabolism

Answer

Berberine activates AMPK, an energy sensor that increases glucose uptake, fatty acid oxidation, and insulin sensitivity while inhibiting gluconeogenesis and lipogenesis.

Question 4

What is the clinical significance of the ratio between omega-6 and omega-3 fatty acids in the Western diet?

Accepted Answer

High omega-6:omega-3 ratio (15-20:1) promotes pro-inflammatory eicosanoid production, linked to chronic disease

Answer

The Western diet ratio of 15-20:1 favors arachidonic acid-derived pro-inflammatory eicosanoids (prostaglandins, leukotrienes); optimal health is associated with ratios closer to 4:1 or lower.

Question 5

N-acetylcysteine (NAC) is used as a supplement primarily because it is a precursor to which endogenous antioxidant?

Accepted Answer

Glutathione (GSH)

Answer

NAC provides cysteine, the rate-limiting substrate for glutathione synthesis, replenishing this critical intracellular antioxidant and detoxification cofactor.

Clinical Nutritionist CCN Practice Test

Clinical Nutritionist CCN Practice Test

Clinical Nutritionist CCN Nutritional Biochemistry and Supplementation 2