What is the primary purpose of dietary fiber in food?

The primary purpose of dietary fiber in food is to aid digestion. Fiber plays a crucial role in maintaining gastrointestinal health by adding bulk to stool, which helps to prevent constipation and promote regular bowel movements. Additionally, fiber can help regulate blood sugar levels by slowing down the absorption of sugar into the bloodstream, which contributes to overall digestive health.

Fiber is not a source of energy or calories, as it cannot be digested by the body in the same way that fats, proteins, and carbohydrates can. Therefore, it does not provide energy or increase calorie intake. While proteins are essential for various bodily functions, dietary fiber does not supply protein. Instead, its main function is to enhance the digestive process, making option related to aiding digestion the most accurate choice.