What is the importance of dietary fiber?

The importance of dietary fiber is primarily linked to its role in aiding digestion and preventing constipation. Fiber is a type of carbohydrate that the body cannot digest, which means it passes through the stomach and intestines relatively intact. This process helps to add bulk to the stool, making it easier to pass and supporting regular bowel movements.

Additionally, dietary fiber plays a crucial role in promoting a healthy gut microbiome by serving as a food source for beneficial bacteria in the digestive tract. This can contribute to overall digestive health, potentially reducing the risk of gastrointestinal disorders.

While energy levels, muscle growth, and fats are essential components of nutrition, they relate to different macronutrients like carbohydrates, proteins, and lipids. Fiber does not provide energy in the same way as these macronutrients and is not directly linked to muscle development or fat provision. Instead, its primary function is to improve digestive health, making option B the correct choice in this context.