The Catholic doctrine of the Eucharist is a real stumbling block to some Protestants who are seriously considering Catholicism. It was for me too, until I explored the subject, historically and scripturally. What follows is a summary of my deliberations.
Catholicism holds that bread and wine literally become the body and blood of Christ when they are consecrated by the priest celebrating the Mass. Oftentimes non-Catholics get hung up on the term transubstantiation, the name for the philosophical theory that the Church maintains best accounts for the change at consecration. The Church’s explanation of transubstantiation was influenced by Aristotle’s distinction between substance and accident.