Dietary fiber is made up of complex carbohydrates that humans lack the enzymes to digest.
Fiber does a number of things that benefit us and, with few exceptions, has no down side except temporary discomfort from increasing it too fast. For example, it makes eating more satisfying by increasing dietary bulk. Not only does this give more chewing satisfaction, but it also helps us feel full. This improves intestinal function by making it easier for your body to move foods and waste products. Studies have shown that fiber prevents constipation, hemorrhoids, and diverticular disease, as well as lowering cholesterol and reducing the blood sugar fluctuations of diabetes.