Dietary fibre is vital for a healthy digestive system and can also help lower the risk of chronic diseases. This nutrient is found in plants, such as fruits, vegetables, whole grains, nuts, and seeds. There are various synonyms for dietary fibre such as roughage, bulk, fiber, and cellulose. Other synonyms for dietary fibre are bran, pectin, and lignin. Bran is the fibrous outer layer of grains and is a good source of insoluble fiber. Pectin is a soluble fiber found in fruits and vegetables and helps to regulate digestion. Lignin is another type of fiber that is present in plants and helps to prevent constipation and bowel diseases.