Complex answer: Cellulose is a polysaccharide that provides structural support for plants. Humans cannot digest cellulose. Thus, you cannot digest wood, which is mostly cellulose.
:Simple answer Humans cannot digest the carbohydrate cellulose.
Soures:AP Biology class, Textbook :3
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Humans can't digest all forms of carbohydrates due to the lack of enzymes needed to break them down. These special enzymes for carbohydrate linkages are not produced in the human body.
not all types of sugar are hard to be digestive some like glocouse
can be part down in the mouth through some sorts of enzymes.