If it is OK with you, TT, I will simply provide the Catechism's reference to the Body and Blood, and let you come to your own conclusion, as to the Catholic Church's stance. It is much too long to post here, without boring everyone half to death, or creating a heated discussion with a passerby who has neither the energy nor the inclination to do the research themselves. Beginning at section1333 and ending with 1344, you will find the basis for the Catholic belief that it truly is the Body and Blood of Christ. I am currently drawing a blank for the word that the Church uses to describe the transfiguration in a scientific context...It will surely come to my though.