Like turning wine and bread into flesh and blood
There's physical evidence for that, at least.
Even Jesus granted that His saying that we must eat His flesh and drink His blood was "a hard saying," a saying at which most of his disciples turned away from Him. Perhaps that's why He's provided the above-mentioned public miracle.
If it's not a symbolic act, then does it not suggest the days when superstitious savages would cut out the hearts of their enemies to eat them and gain their strength ?
A week later his disciples were in the house again, and Thomas was with them. Though the doors were locked, Jesus came and stood among them and said, "Peace be with you!" Then he said to Thomas, "Put your finger here; see my hands. Reach out your hand and put it into my side. Stop doubting and believe." Thomas said to him, "My Lord and my God!" Then Jesus told him, "Because you have seen me, you have believed; blessed are those who have not seen and yet have believed."