Foods with a coarse texture do not necessarily contain more dietary fiber. Dietary fiber can be divided into soluble and insoluble dietary fiber according to whether it dissolves in water. Soluble dietary fiber comes from konjac, alginate gum, pectin, etc., and has a relatively delicate taste; insoluble dietary fiber comes from whole grains, legumes, vegetables and fruits, etc. Whole grains include cereal, bran, whole wheat flour, brown rice, oats, etc., and has a relatively coarse taste. Soluble dietary fiber does not have a rough texture, and most vegetables and fruits rich in insoluble dietary fiber do not have a rough texture, such as bananas and apples. Kiwifruit is not as rough as pineapple, yet it contains twice as much dietary fiber as pineapple, so foods with a rough texture are not necessarily high in dietary fiber. Dietary fiber is a kind of carbohydrate that cannot be digested by the human body, and consuming the right amount of dietary fiber can stimulate the secretion of digestive juices and peristalsis of the large intestine, reduce the time that food stays in the intestine, and help to pass stools. However, excessive intake of dietary fiber may increase intestinal gas production, leading to bloating, abdominal pain and other discomfort.