Question

why humans can't digest cellulose ​

Answer 1

the human digestive system has lot of enzymes and acids to break down and essimilate all kind of different food but we do not have enzyme that needed to break down cellulose .
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hope this helps you

Answer 2

Answer:

Humans cannot digest cellulose, but it is important in the diet as fibre. Fibre assists your digestive system – keeping food moving through the gut and pushing waste out of the body. Animals, such as cows, sheep and horses, can digest cellulose, which is why they can get the energy and nutrients they need from grass.