Dietary fiber is a type of carbohydrate that cannot be digested by the body. Other synonyms for dietary fiber include roughage, cellulose, lignin, and plant-based fibers. While some fibers are soluble, such as pectin and beta-glucans, others are insoluble, such as hemicellulose and bran. Soluble fibers dissolve in water and form a gel in the intestines, whereas insoluble fibers help to add bulk to stool and move it through the digestive system. Adequate intake of dietary fiber has numerous health benefits, including promoting satiety, lowering cholesterol levels, improving blood sugar control, and reducing the risk of chronic diseases such as heart disease, diabetes, and certain cancers.