Well, if there was no way that His words could be taken symbolically (which they can) that would be the case. However, since they are to be taken symbolically, Jesus isn’t a liar.
You know, I might agree with you, but Jesus didn’t say: “This represents my body”, He said : “This is my body”. And He said "For my flesh is food indeed, and my blood is drink indeed. "
St. John wrote the last statement in his Gospel, and he also passed on to others what he meant ( remember what St. Paul tells Timothy: “and what you have heard from me before many witnesses entrust to faithful men who will be able to teach others also.”) , and that is why St. Ignatius (who was taught by St. John) writes :
“I have no taste for corruptible food nor for the pleasures of this life. I desire the bread of God, which is the flesh of Jesus Christ, who was of the seed of David; and for drink I desire his blood, which is love incorruptible” (Letter to the Romans 7:3 [A.D. 110]).
“Take note of those who hold heterodox opinions on the grace of Jesus Christ which has come to us, and see how contrary their opinions are to the mind of God. . . . They abstain from the Eucharist and from prayer because they do not confess that the Eucharist is the flesh of our Savior Jesus Christ, flesh which suffered for our sins and which that Father, in his goodness, raised up again. They who deny the gift of God are perishing in their disputes” (Letter to the Smyrnaeans 6:2–7:1 [A.D. 110]).
(St. Ignatius doesn’t sound like he was taught that Jesus was speaking symbolically, it sound to me like St. John taught him that Jesus was being literal.)
And the fact that Eucharistic miracles have occurred and still occur (to a priest that I know personally), plus since I have spent several years before the Blessed Sacrament, I have to come to know in my heart that Jesus is truly, really, and substantially present under the appearances of bread and wine.