Why The polysaccharides and the disaccharide collapse at the Digestive System?

The polysaccharides and the disaccharide broken down at the digestive System because our body cannot absorb it.

Explanation:

Polysaccharides and disaccharide are macromolecules which is made of many glucose molecules. Our body only absorb glucose because it has small size which can pass through a semipermeable membrane of the cell. So for the absorption of glucose molecules, first the polysaccharide and disaccharide are broken down into simpler substances like glucose in the stomach of digestive system and then use by the cell for energy production.