What is the significance of the Eucharist's sacramental species?

When we receive the Holy Eucharist we consume Jesus's glorified body. Now many say it is purely spiritual food. > The sacrament of the Holy Eucharist was instituted as a food, **a > spiritual food**(source ). Also > Since the Holy Eucharist is a spiritual food, it does for the soul > what physical food does for the body. When we eat physical food, it > becomes united to us—it is changed into our own substance and becomes > a part of us. > > In Holy Communion, something analogous happens to us spiritually, but > with a great **difference**: in this case, it is the individual who is > united to the Food, not the Food to the individual. The lesser is > united to the Greater. We become one with Christ. **Now my question is:** if the Eucharist is a spiritual food why does it need to be presented in a physical form? As a host? Did Jesus embed a physical union with his body too? Does the physical form have any effects on our physical body too? What does the Catholic Church have to say about this? He could simply say for example: Pray: Our Father as your spiritual food...or read the bible as your spiritual food but since he established the Eucharist in a physical form there must be some meaning behind it too. Note: I found some answers here but I wondered if someone found something more in regards to this statement How is a glorified body related to molecules, to that which constitutes non-glorified material objects? The answer is a mystery.