WJEC Food Science and Nutrition Level 3 Practice Test 2026 - Complete Exam Prep

Insoluble fibre resists digestion and is not absorbed into the bloodstream. It passes through the gut largely intact and adds bulk to the stool, helping to move food through the digestive tract and promote regular bowel movements. That makes the description "not absorbed, helps food pass through the digestive system" the correct match. The other statements describe characteristics of soluble fibre or functions that aren’t about insoluble fibre (such as energy storage or lowering cholesterol). Insoluble fibre does not store energy, and it doesn’t lower digestion—its main effect is to speed transit and increase stool bulk.