Jesus was very specific. This is my body, this is my blood. He could have said "this represents my body and blood" but He didn't.
This commentary seems to suggest it represents the body and blood.
"
26:26 7 And as they were eating, Jesus took bread, and l blessed [it], and brake [it], and gave [it] to the disciples, and said, Take, eat; m this is my body.
(7) Christ who will without delay fulfil the promises of the old covenant, institutes a new covenant with new signs.
(l) Mark says, "Had given thanks": and therefore blessing is not a consecrating with a conjuring type of murmuring and power of words: and yet the bread and the wine are changed,
not in nature but in quality, for without doubt they become
tokens of the body and blood of Christ, not of their own nature or force of words, but by Christ his institution, which must be recited and laid forth, that faith may find what to lay hold on, both in the word and in the elements.
(m) This is a figure of speech which is called metonymy: that is to say, the giving of one name for another: so he calls the bread his body, which is the sign and sacrament of his body: and yet nonetheless, it is a
figurative and changed kind of speech meaning that the faithful do indeed receive Christ with all his gifts (though by a spiritual means) and become one with him.
"Lu.
(p) Or covenant, that is to say, by which the new league and covenant is made, for in the making of leagues they used the pouring of wine and shedding of blood. "
Matthew - Chapter 26 - Geneva Study Bible on StudyLight.org
Except I didn't call anyone an allegory.
If you call the story of Adam and Eve an allegory, and think that if Eve existed she really was spawned of animals...who really cares what you call it. There is only one word for it, disbelief.