We, as humans, cannot digest cellulose.
Work Step by Step
Humans cannot digest cellulose because they do not have the enzymes that can recognize and cleave B1to4 linkages. While glycogen and cellulose are both glucose polymers, the linkages between glucose residues are different. So, human enzymes are specialized to digest the glycogen linkages (a1to4) and do no have the ability to digest the cellulose linkages.