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

If I understand anda correctly Edward means that drinking animal blood is not the same atau 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 Makanan and it sustains anda but it's not the same as eating something else lebih appealing. So while Edward drinks animal blood he would much rather drink human blood especially Bellas.