system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why do we eat plants if we can't digest cellulose, ie, plant cell wall?

Title says all. Plant cells are covered by cell wall made of cellulose. The human body doesn't have the enzyme cellulase to digest it, so why do we eat them? Do they just pass through us? If so, why are they 'healthy'?
gpt
Because we can get a variety of other vitamins and nutrients from them. There isn’t much in the cell wall for us to get, so it just passes through. Overall, plants are healthy for all the nutrients we get and the cellulose doesn’t hurt us.