What is the primary function of fiber in the body?

The primary function of fiber in the body is indeed to help with digestion. Fiber is a type of carbohydrate that the body cannot digest. It plays a critical role in maintaining healthy bowel movements and preventing constipation by adding bulk to the stool, which helps it pass more easily through the gastrointestinal tract. Additionally, fiber can help support a healthy gut microbiome, as it can act as a food source for beneficial gut bacteria. This interaction contributes to the overall health of the digestive system and can aid in the prevention of digestive disorders.

While fiber can have secondary benefits in areas such as regulating blood sugar levels and supporting weight management, its fundamental role centers around digestive health, positioning it as a key player in ensuring efficient food processing and nutrient absorption. The other options provided refer to functions more closely associated with other macronutrients or metabolic processes rather than solely focusing on the important digestive benefits of fiber.