Evolution has had a long history of various sorts of predation. Some that have survived are the various parasites that plague all species. This means all manner

Evolution has had a long history of various sorts of predation. Some that have survived are the various parasites that plague all species. This means all manner of attack on an organism have been randomly tried. We know we have viral invasions in the past - we have many relice of dormant viruses in our genome - some have even become involved in core processes of various organisms. This means that any method of attack via the alimentary canal are very unlikely to succeed = no acquisition of traits or attributes by eating meat. Some simpler organisms, like nematodes have demonstrated the ability to learn what was trained into a task to acquire some aspects of that training by cannibalism = eating + learning...