with the setting of the sun this evening. As one of the Church's penitential seasons, fasting is always appropriate during Advent. Some suggestions: remember Cassian's words that "the fathers have only one invariable rule of fasting: stop eating before you are full;" think simple meals; since Wednesday and Friday are penitential days, maybe eat only a light breakfast and then skip lunch and after sunset have a simple, but normal sized dinner on those days; the Ember Days in Advent will fall on the Wednesday, Friday, and Saturday after Gaudete.
Lutherans, unlike other liturgically minded Christians, do not observe a distinction of meats - hence, there are no foods that we regard as "off-limits" during these days, as we joyfully confess that all things God created are good and nothing is to be rejected, if it is received with thanksgiving. Yet, moderation in food and drink - something we ought always to practice! - is certainly appropriately strengthened by seasons when we practice "cutting back" - i.e., going hungry for a bit. Also, since the point of going hungry is not merely to train the body, but far more to provide extra time for prayer and money for alms (what you don't eat that day, you can give away!), a suggestion on any lunches or breakfasts you forgo is to spend the time in praying the Litany and some Psalms, and intentionally upping your charitable giving, particularly to those ministries that focus on feeding the hungry.
Again, unlike other liturgical traditions, Lutherans most certainly do not need to consult any "spiritual father" about such matters - rather, prayerfully, intentionally, and in your God-given Christian freedom embrace whatever practice you think would work well for you in these days. Above all, clear the clutter - make some space in your life during these days of preparation for the Holy Spirit to do His joyful work through the Word and the Sacrament. Make a special effort to attend the extra services. To read in your Scriptures each day (USE that Treasury!), and enjoy the splendid feast that the Church in her love sets before you in these holy days. You will come to the Christmas Feast with a peaceful and joyous heart.
Two caveats to certain readers: Orthodox and RC, you do not need to tell me how the above is all wrong. We know what you all think about such things. God bless your own time of preparation; but don't hold us to your disciplines which we simply do not acknowledge.
Also, my beloved Past Elder, we do not need yet another lecture on your opinions about fasting... any reader of this blog already knows what you think of it. Enjoy your Christian freedom and let the rest of us enjoy ours!