Humans can't digest cellulose bcoz our digestion system have no cellulase, the enzyme that is needed for digestion of cellulose......

Why Humans Can't Digest Cellulose?
Cellulose is a complex carbohydrate found in the cell walls of plants. While humans can digest many types of carbohydrates, such as starch, our digestive system lacks the necessary enzymes to break down cellulose. This inability to digest cellulose is due to several key reasons:

Lack of Enzymes:
Humans lack the enzyme cellulase, which is required to break down the beta bonds that link the glucose molecules in cellulose. Without this enzyme, our bodies cannot effectively break down cellulose into its component sugars for absorption.

Cellulose Structure:
The structure of cellulose is highly complex and rigid, forming a tough, fibrous material that is resistant to digestion. Unlike starch, which consists of alpha glucose molecules that are easily broken down by human digestive enzymes, cellulose is made up of beta glucose molecules arranged in a way that makes it indigestible for humans.

No Cellulose-Digesting Organisms:
Unlike ruminant animals like cows, which have specialized gut microbes that can break down cellulose, humans do not have the necessary microorganisms in their digestive system to digest cellulose effectively. This lack of cellulose-digesting organisms further contributes to our inability to digest this plant material.

Role of Fiber:
While humans cannot digest cellulose, it still plays an essential role in our diet as dietary fiber. Fiber helps promote digestive health, regulate bowel movements, and may even reduce the risk of certain diseases. Although we cannot digest cellulose, it remains an important component of a healthy diet.
In conclusion, the inability of humans to digest cellulose is primarily due to the lack of specific enzymes, the complex structure of cellulose, and the absence of cellulose-digesting organisms in our digestive system. Despite this limitation, cellulose still plays a crucial role in our overall health and should be included as part of a balanced diet.