Singapore GCE N(A)-Level Nutrition And Food Science Practice Questions - Singapore-Cambridge GCE Normal (Academic) Level Nutrition And Food Science Exam

How does insoluble dietary fibre (such as cellulose) prevent constipation in the digestive system?

It absorbs water, swells, and adds bulk to stools, stimulating peristalsis along the gut. It breaks down into simple sugars that lubricate the mucosal lining of the colon. It neutralises stomach hydrochloric acid to accelerate gastric emptying. It dissolves completely in bile to emulsify unabsorbed dietary lipids.

Correct Answer:

It absorbs water, swells, and adds bulk to stools, stimulating peristalsis along the gut.

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