If wine is truly transformed to Blood during Eucharist, why would “someone cannot consume wine because of health reasons” become one of the problems when receiving the sacrament? Doesn’t transformed wine become non-wine oriented?
Fr. Francis' answer:
This is because the transformation of the bread and wine to the Body and Blood of Christ is the real, substantial change into the Real Presence of Christ, but not the material external change into the physical, glorified Body and Blood of Christ. St. Thomas Aquinas described this as the change of the underlying (invisible) substance, or essence, but the material “accidents” like colour, shape, smell, taste, and yes, the alcoholic effects are not changed.
In other words, the Eucharistic Body and Blood, if put under the microscope, would still show up as wheat and gluten, grape juice and alcohol. They would have the same detrimental chemical effect on a celiac patient or an alcoholic respectively. Yet they are truly and substantially Christ’s Body, Blood, Soul and Divinity.
How can this be?