Bah, you're not serious.
Eating is not really a specific connotation of consuming communion. More likely, it could have been anything so that you would be having a "divinity" deeply intimately inside you. Eating simply is the means for this, a symbolic action. Consuming God, God giving itself up for your own nourishment, a humble and selfless God...etc.
Jesus's fables and stories always involved current events / mundane actions. The mundane symbol of eating bread and wine granting something as mystical as divinity simply follows his pattern. The mindset of a normal person in those days basically was cause and effect. In many cases, the regular person didn't know why something happened, just that something did happen. This, then, made it easier to accept the notion of eating a god's flesh and blood (symbolized by bread and wine in this case) which would grant, in the example of Christianity, divinity. Because bread and wine were so dissimilar to flesh and blood, and the whole belief in Jesus as God, fancying the idea of cannibalism was probably not something widespread at all.
Also, since traditional bible lore points to humans being of the Earth, this could be considered cannibalism as much as eating an apple would be.
In any case, you're just being nit-picky about this.