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 occur

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.