What is the primary function of fiber in the diet?

The primary function of fiber in the diet is to aid in digestion by providing bulk. Fiber consists of plant-derived components that the body cannot fully digest, which helps to add bulk to the stool. This bulk is essential for promoting regular bowel movements and preventing constipation by facilitating the movement of food through the digestive tract. Additionally, fiber plays a crucial role in maintaining overall gut health and may help prevent various digestive disorders.

While fiber is important for digestive health, it does not provide energy like carbohydrates or fats, nor does it supply vitamins directly. Fiber does not build muscle either, as that is primarily the role of proteins in the diet. By focusing on its role in digestion, it becomes clear why fiber is classified mainly as a beneficial component for maintaining a healthy digestive system.