I didnt quite get it when Edward 说 to Bella in the fist movie.."It's not like drinking ur blood for instance"

If I understand 你 correctly Edward means that drinking animal blood is not the same 或者 as good as drinking a human's blood, namely Bellas. He's comparing it to how it would be for humans eating tofu. It's 食物 and it sustains 你 but it's not the same as eating something else 更多 appealing. So while Edward drinks animal blood he would much rather drink human blood especially Bellas.