What is a key characteristic of fibers among carbohydrates?

Fibers are indeed recognized for their unique characteristics among carbohydrates, particularly their role in the digestive process. One of the main distinctions of fiber is that it is not a fuel source for the body in the way that simple sugars or starches are. Unlike other carbohydrates that are broken down into glucose and used for energy, fiber is not digestible by the human body. It passes through the digestive system largely intact, supporting digestive health by aiding in bowel regularity and contributing to a feeling of fullness.

This characteristic positions fiber as a vital component of a healthy diet, primarily for its benefits beyond energy provision. While some carbohydrates serve as primary energy sources, fibers do not fit into this category. They help regulate blood sugar levels, lower cholesterol, and promote beneficial gut bacteria, illustrating their essential role in overall health rather than energy production.