Well now that you have posted his "research" I think it is safe to say that at best his research is biased, at worse it is a blatant ignoring of context and good methodology. As in at least as St. Ambrose is concerned there is no question that by "spiritual" food he is refering to the spiritual benefits of Christ's body, not to a mode of presence as he makes it quite clear that he believes that it is Christ's body that is offered.
Here are a few more words by Ambrose concerning the Sacrament of the Altar.
BTW you can check out St. Ambrose's writtings yourself at Christian Classics Ethereal Library a great resource for historical church writings.
Here are a few more words by Ambrose concerning the Sacrament of the Altar.
Yeah he did his research real well. Yeah right.Let us use the examples He gives, and by the example of
the Incarnation prove the truth of the mystery. Did the course of nature proceed as usual when the
Lord Jesus was born of Mary? If we look to the usual course, a woman ordinarily conceives after
connection with a man. And this body which we make is that which was born of the Virgin. Why
do you seek the order of nature in the Body of Christ, seeing that the Lord Jesus Himself was born
of a Virgin, not according to nature? It is the true Flesh of Christ which crucified and buried, this
is then truly the Sacrament of His Body.
54. The Lord Jesus Himself proclaims: “This is My Body.”2898 Before the blessing of the heavenly
words another nature is spoken of, after the consecration the Body is signified. He Himself speaks
325
of His Blood. Before the consecration it has another name, after it is called Blood. And you say,
Amen, that is, It is true. Let the heart within confess what the mouth utters, let the soul feel what
the voice speaks.
52. We observe, then, that grace has more power than nature, and yet so far we have only spoken
of the grace of a prophet’s blessing. But if the blessing of man had such power as to change nature,
what are we to say of that divine consecration where the very words of the Lord and Saviour operate?
For that sacrament which you receive is made what it is by the word of Christ. But if the word of
Elijah had such power as to bring down fire from heaven, shall not the word of Christ have power
to change the nature of the elements? You read concerning the making of the whole world: “He
spake and they were made, He commanded and they were created.”2897 Shall not the word of Christ,
which was able to make out of nothing that which was not, be able to change things which already
are into what they were not? For it is not less to give a new nature to things than to change them.
“Taste and see that the Lord is good, blessed is the man that hopeth in Him.”2904 In that
sacrament is Christ, because it is the Body of Christ, it is therefore not bodily food but spiritual.
BTW you can check out St. Ambrose's writtings yourself at Christian Classics Ethereal Library a great resource for historical church writings.