What role does fiber play in a healthy diet?

Fiber plays a crucial role in maintaining a healthy diet primarily by aiding in digestion and helping to lower cholesterol levels. It is a type of carbohydrate that the body cannot digest, which means it passes through the digestive system largely intact. This promotes regular bowel movements and helps prevent constipation, establishing a healthy digestive tract.

Additionally, fiber can bind to cholesterol in the digestive system, preventing its absorption into the bloodstream. This function is vital for maintaining heart health, as lower cholesterol levels can reduce the risk of cardiovascular diseases. Moreover, foods high in fiber often require more chewing, which can promote fullness and help control appetite, contributing to overall weight management.

In contrast, consuming fiber does not primarily provide energy, as the body processes it differently than digestible carbohydrates. It is not aimed at weight gain, and it certainly plays a significant role in promoting heart health, contrary to the notions presented in the other answer choices.