What is the primary function of dietary fiber in the human body?

The primary function of dietary fiber in the human body is to aid in digestion. Dietary fiber is a type of carbohydrate that cannot be digested in the same way as other carbohydrates. Instead, it passes through the gastrointestinal tract largely intact, which plays a crucial role in digestive health.

One of the key aspects of dietary fiber is its ability to add bulk to the stool, which helps to facilitate regular bowel movements and prevent constipation. It also supports the growth of beneficial gut bacteria, which further enhances digestive health. Additionally, certain types of soluble fiber can help regulate blood sugar levels and lower cholesterol, contributing to overall digestive and metabolic health.

While fiber is not a source of energy as other macronutrients are, it plays an essential role in the overall functioning of the digestive system, making it vital for maintaining a healthy gut. This function clearly aligns with the correct answer provided.