What is the main function of fiber?

The main function of fiber is to aid in digestion and promote satiety. Fiber is a type of carbohydrate that the body cannot digest. It passes through the digestive system largely undigested, which helps to keep the digestive tract functioning smoothly. By adding bulk to the stool, fiber facilitates regular bowel movements and helps prevent constipation.

In addition to its role in digestion, fiber also contributes to the feeling of fullness or satiety after meals. It slows down the digestive process, which can help control appetite and reduce overall calorie intake. This quality makes fiber an important component of a balanced diet, particularly for those looking to manage their weight.

Fiber does not directly boost vitamin intake, increase glycemic response, or provide essential fatty acids, which are functions associated with other nutrients or dietary components. Instead, its unique benefits lie in improving digestive health and helping individuals maintain a healthy weight through enhanced satiety.