One reason is that it enhances gut motility by providing the gut walls substance to "hold onto" and prevent constipation.
as an example: fiber, chitin
Dietary fiber, for humans, is indigestible. Any indigestible materials are excreted out of the body, and fiber is no exception.
Cellulose (plant fiber)
yes any fruit does because it contain indigestible fiber which helps push things through your digestive system, but there are things that have much more fiber than grapes.
Fiber
Indigestible material is primarily made up of insoluble fiber. This plant materials adds bulk to the feces.
It's indigestible, so yes.
Cellulose is indigestible to humans because it acts as a hydrophyllic bulking agent to human feces. It is consist of non-starch polysaccharides. Its a soluble fiber, that's why cellulose is indigestible.
Dietary fiber is any indigestible sugar polymer (e.g. cellulose, pectin, chitin, inulin, oligosaccharide) or other any similar indigestible plant polymer (e.g. lignin).
Some examples of things that are generally considered indigestible by humans include cellulose (a complex carbohydrate found in plant cell walls), certain types of fibers (such as insoluble fibers), and certain parts of animals that are difficult to break down (such as bones and cartilage). Additionally, some substances like plastic or metals are not meant to be ingested and are indigestible by the human digestive system.
Dietary Fiber such as bran
proteins, carbohydrates and fats, (fiber is a carbohydrate that is indigestible, typically cellulose)