[cubefox]

> The human body does not contain enzymes that digest cellulose. So how is this degradation to occur?

Mostly outside the body, before ingestion occurs.

> Being accustomed to something doesn't mean the thing doesn't hurt us.

I disagree. Evolution had the last ~360 million years (that's about how old cellulose is I believe) to evolve mechanisms to protect our body from cellulose particles.

[pfdietz]

Evolution has had the last ~360 million years for us to evolve enzymes to digest cellulose. And yet we can't.

> Mostly onside the body, before ingestion occurs.

This is an obviously silly statement. Of course cellulose can be ingested in various ways, including extremely small particles.