Right now i'm leaning towards 51% yes we do need meat as when i became a vegan it nearly killed me & left me sterile HOWEVER there are people that say it works just fine for them , perhaps i don't have the correct gene expression to sustain it properly or i just did something wrong like my plants were not really organic & i was poisoning myself. I'm also leaning towards my gut bacteria was not producing any b-12 so that lead to a severe deficiency. I have been eating a lot of fermented foods lately , so i'm willing to see if this was the case.
RE: The real reason eating meat/dairy is bad for you (It has nothing to do with what you are thinking)