[user104658]

You literally can't get all of the nutrients you need from an "animal free" diet, you need to supplement some unless you continue to eat some things, like fish / eggs etc. (which some "ethical veggies" do), and vegans (who also cut dairy) struggle to get enough protein no matter what they do (as almost all supplements are milk-based).

Although... I hear that insects (such as Big Brother favourites salt and vinegar grasshoppers) make an excellent, environmentally friendly meat substitute... And no one is going to cry over insect rights. Surely??