What is the role of dietary fiber in nutrition?

Dietary fiber plays a crucial role in promoting digestion and nutrient absorption. It consists of plant-based carbohydrates that are not fully digested by the human body. This means that fiber does not contribute calories like other macronutrients and instead serves several important functions.

Primarily, fiber aids in regulating the body's digestive system. It adds bulk to stool, which facilitates regular bowel movements and helps prevent constipation. Soluble fiber, in particular, can also slow down digestion and nutrient absorption, leading to a more gradual release of glucose into the bloodstream. This moderation helps in maintaining stable blood sugar levels, which is particularly beneficial for individuals managing diabetes or those looking to sustain energy levels.

Additionally, fiber plays a role in feeding beneficial gut bacteria, promoting a healthy microbiome, and there is increasing evidence to suggest that a healthy gut microbiome is linked to better overall health, including reduced risk of chronic diseases.

In summary, the role of dietary fiber in nutrition is invaluable as it promotes digestion, supports regularity, and aids in nutrient absorption, making option C the clear choice.