A no brainer for me. Whatever He says, I take and accept. If He says it's His Body, then it is. End of discussion. If the Creator says something, then it is what it is. Any attempt to change the words by interpretation is to do violence to those words. I'd rather protect the words of Jesus than re-interpret them to suit my mere human logic. Let's also not forget that He is our Passover Lamb - and that lamb, according to the Law, must be eaten. On this point alone there words "this is my Body, this is my Blood" should be self evident as being more than a mere symbol.
Let's also not forget that the Greek word for remembrance is anamnesis- which is not remembrance in the sense of remembering a holiday or a birthday or where you put your car keys, but in the sense of a re-participation. Thus, at Pesach (Passover), we re-participate in the Exodus. So, for the disciple of Jesus, we don't merely remember the crucifixion of Jesus but participate in it, completely partaking in our Passover Lamb.