How does fiber aid in digestion?

Fiber plays a critical role in digestion primarily by regulating the body's use of sugars. It contributes to a slower and more controlled release of glucose into the bloodstream after a meal. This regulation helps to prevent sharp spikes in blood sugar levels, which can be particularly beneficial for individuals managing conditions like diabetes.

When fiber is consumed, it forms a gel-like substance in the digestive tract, which can slow down the process of digestion. This delayed gastric emptying allows for more gradual absorption of sugars, fostering a more stable energy level and reducing the risk of insulin spikes. Additionally, fiber helps maintain gut health by promoting beneficial bacteria, which further aids in the fermentation of some types of fiber, producing short-chain fatty acids that enhance digestion and provide an energy source for colon cells.

Consequently, the role of fiber in regulating the use of sugars is fundamental to not only digestive health but also overall metabolic efficiency. Thus, option B represents the most accurate understanding of how fiber aids in digestion.