Here, I'll give you the argument that it is literally "fast", which causes hunger. Don't you see that the pasage is saying, LET US conduct ourselves for God's glory no matter what the circumstance are, in the good and in the bad?
It doesn't say Thou shalt fast. Let's review verses 4 thru 6 from the translation you have:
4 But in all things let us exhibit ourselves as the ministers of God, in much patience, in tribulation, in necessities, in distresses, 5 In stripes, in prisons, in seditions, in labours, in watchings, in fastings, 6 In chastity, in knowledge, in longsuffering, in sweetness, in the Holy Ghost, in charity unfeigned
Are we also "commanded" to be whipped and go to prison?
By the way, I am delighted to see that you go back to the original Greek of the New Testament.
We are commanded to continue in God's ministry as we are whipped or jailed, yes. St. Paul indeed mixes things that are done to us, such as persecutions, and things that we do voluntarily, as vigils (watchings), fasting, chastity, and knowledge. He commands both kinds.
refer to lots of different translations when a passage is being quetioned
The reason Protestant translations exist in the first place is to lie about the Gospel. Read Douay, and check with the Greek original. You can safely ignore the rest.
To me "the church" is the group of people who are true believers and have surrendered themelves to Jesus.
To you, "the church" is the authority of the Catholic institution.
The Catholic Church is both a group of people, here and in the afterlife, and an institution founded by God and lead by Him. The passage about the Church in Matthew 18, cited before on this thread, is meaningless if it were to refer to the Protestant communities of faith, which cannot agree on much between themselves and don't even pretend to be final arbiters of anything. The proper definition of Church is given by St. Paul as the body of Christ, hierarchical and undivided (1 Cor 12, Col 1, John 17)