Jean Inman Food Science Practice Exam 2026 - Free Food Science Practice Questions and Study Guide

Cellulose is classified as a non-digestible fiber due to its structural composition and the way it interacts with human digestive enzymes. It is a type of carbohydrate that is found in the cell walls of plants and serves as a crucial component for their structure. Humans lack the enzymes necessary to break down cellulose into its component glucose units, meaning it cannot be digested in the same way that other carbohydrates can.

Instead, cellulose passes through the digestive system largely intact and contributes to dietary fiber intake. This non-digestibility is significant because it helps regulate bowel movements, contributes to feelings of fullness, and can assist in maintaining overall digestive health.

While cellulose is also considered a complex carbohydrate because it is a polymer consisting of many sugar molecules linked together, its classification as a non-digestible fiber is more pertinent in the context of human nutrition and digestion.