CNC Digestive Health & Gut Nutrition 3

Question 1

Small Intestinal Bacterial Overgrowth (SIBO) is best defined as:

Accepted Answer

An abnormally high number of bacteria colonizing the small intestine

Answer

SIBO occurs when bacteria, often from the colon, proliferate abnormally in the small intestine (>10^3–10^5 CFU/mL), causing bloating, malabsorption, and diarrhea.

Question 2

Which nutrient is most critical for maintaining intestinal mucosal integrity and supporting enterocyte proliferation?

Accepted Answer

Glutamine

Answer

Glutamine is the primary fuel source for enterocytes (intestinal lining cells) and is essential for maintaining tight junctions and the integrity of the intestinal mucosal barrier.

Question 3

What is the key functional difference between soluble and insoluble dietary fiber?

Accepted Answer

Soluble fiber dissolves in water and forms a gel, slowing digestion; insoluble fiber does not dissolve and adds bulk to stool

Answer

Soluble fiber (oats, legumes) dissolves in water to form a viscous gel that slows digestion and helps lower cholesterol and blood glucose, while insoluble fiber (wheat bran, vegetables) resists dissolution and promotes bowel regularity by adding stool bulk.

Question 4

Which dietary pattern is most consistently associated with greater gut microbiome diversity?

Accepted Answer

Plant-rich diet high in diverse fruits, vegetables, legumes, and whole grains

Answer

Research shows that diets rich in diverse plant foods increase microbiome diversity by providing a wide range of fiber substrates and phytonutrients that feed different microbial species.

Question 5

Short-chain fatty acids (SCFAs) such as butyrate, propionate, and acetate are produced when gut bacteria ferment dietary fiber. What is a primary health benefit of butyrate specifically?

Accepted Answer

It serves as the main energy source for colonocytes and supports colon mucosal health

Answer

Butyrate is the preferred energy substrate for colonocytes (colon lining cells), supporting mucosal integrity, reducing inflammation, and playing a role in colorectal cancer prevention.

(CNC) Certified Nutrition Coach Practice Test

(CNC) Certified Nutrition Coach Practice Test

CNC Digestive Health & Gut Nutrition 3