When you eat a plant, you derive energy from the stored starch, but not from the cellulose component.
We eat plant to derive energy that they have acquired through photosynthesis for performing various functions of our body.
Starch and Cellulose has a basic difference between their structure that starch do not have 1,4-glycosidic linkage.
Our digestive system have enzymes like amylase, that can break down the starch into smaller molecules when can be further broken down by other enzymes such as maltase, lactase, etc. Hence we are able to derive energy from starch.
On the other hand our digestive system has no enzymes to digest cellulose hence we are not able to derive energy from it.
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