And we'll talk much more about cellulose in future lecture. So we see that polysaccharides are used either to store energy and then convert that into ATP molecules as it happens inside our cells or they can be used in the form or they can be used to give the cell structure and protection as the case is. With cellulose in plant cells now inside our body we do not have enzymes that can break down these beta one four Glycosytic bonds in cellulose. But even though we can break down cellulose these types of polysaccharides are very important constituents of our diet because this is what we call dietary fiber. Cellulose is an insoluble fiber that we can ingest into our body. And what it does is it AIDS in the process of digestion.