What is the primary function of dietary fiber in nutrition?

The primary function of dietary fiber in nutrition is to assist in digestion. Dietary fiber is classified into two types: soluble and insoluble. Soluble fiber dissolves in water and can help regulate blood sugar levels and lower cholesterol, while insoluble fiber adds bulk to stool and aids in the movement of food through the digestive tract. This bulk formation assists in preventing constipation and promotes regular bowel movements, which are crucial for digestive health.

Fiber does not provide energy directly, as it is not digested or absorbed in the same manner as other macronutrients like carbohydrates, proteins, or fats. Moreover, fiber does not supply vitamins and minerals, although many fiber-rich foods, such as fruits, vegetables, and whole grains, may contain these nutrients. Finally, while body cells require various nutrients to function appropriately, fiber itself is not responsible for the creation of body cells; that role is filled by proteins, lipids, and other nutrients essential for cellular structure and function.