I'm preparing for Great Fast even now, if only in terms of what I purchase at the grocery store. Lots of fish, obviousy. Does "dairy" include eggs? I can't eat bread, so if it does, it's going to mean fish, broccoli/carrots, etc. and more fish. Good thing I live in salmon country...
Suffice it to say that some of us might be called to do that "little bit extra" for the sake of our souls and for the needs of those who ask our prayers. 40 days is not insurmountable, and "fasting" in the religious sense, obviously, does NOT mean starving. It simply refers to forgoing certain treats and enjoyable things for a period of time for the sake of our souls. "Offer it up" will be observed with frequency and obedience, perhaps even with joy. Obviously. (a little pedantry there for any visitors here who might think we are all preparing to starve ourselves for the next month and a half.)
Dairy includes eggs, unfortunately. But R, fast under the guidance of your spiritual father and in accrodance with your own physical situation. Making yourself ill is contrary to God's creation of us in His image.
Vegetables are good for you and as an Alaskan you know all about shellfish and fin fish. The net is filled with great recipes for the Fast.