Dietary fiber is another kind of complex carbohydrate. Though it does not act as a source of energy for the body it provides many other positive benefits. Fiber is classified by nutritionists as either insoluble fiber or soluble fiber. This is based on whether it dissolves in water. Both insoluble and soluble fibers are incapable of being broken down by the body's digestive enzymes. For this reason, fiber adds no additional calories to your diet and it cannot be converted to glucose.
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.
Fiber
Dietary Fiber such as bran
proteins, carbohydrates and fats, (fiber is a carbohydrate that is indigestible, typically cellulose)
Dietary fiber, for humans, is indigestible. Any indigestible materials are excreted out of the body, and fiber is no exception.
Primarily cellulose, which unlike animal cells, use cellulose for their cell walls instead of phospholipids. Most animals lack the ability to digest cellulose, except for ruminants like cows, which have an enzyme called cellulase to break this down.
Cellulose is an insoluble carbohydrate found in plants and plant products. It is the main structural component of plant cell walls and provides structural support to plants. Unlike soluble carbohydrates, such as starch, cellulose cannot be broken down by human digestive enzymes.
The complex carbohydrate present in the cell walls of plants and forms the bulk of indigestible fiber in your diet is cellulose. It is made up of long chains of glucose molecules and provides structural support to plant cells. Though humans lack the enzymes to digest cellulose, it is important for maintaining digestive health and providing bulk to stool.
glycogen
Fiber
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.
No, wood does not have any nutritional value for humans. It is primarily composed of cellulose, which is indigestible by the human body.