I believe that the "why" of fasting is at least as important as the "what." I feel that the following guidance from the OCA site is germane:
A special word must be said about fasting during lent. Generally speaking, fasting is an essential element of the Christian Life. Christ fasted and taught men to fast. Blessed fasting is done in secret, without ostentation or accusation of others (Mt 6:16; Rom 14). It has as its goal the purification of our lives, the liberation of our souls and bodies from sin, the strengthening of our human powers of love for God and man, the enlightening of our entire being for communion with the Blessed Trinity.
The Orthodox rules for lenten fasting are the monastic rules. No meat is allowed after Meatfare Sunday, and no eggs or dairy products after Cheesefare Sunday. These rules exist not as a Pharisaic "burden too hard to bear" (Lk 11:46), but as an ideal to be striven for; not as an end in themselves, but as a means to spiritual perfection crowned in love. The lenten services themselves continually remind us of this.
"Let us fast with a fast pleasing to the Lord. This is the true fast: the casting off of evil, the bridling of the tongue, the cutting off of anger, the cessation of lusts, evil talking, lies and cursing. The stopping of these is the fast true and acceptable." (Monday Vespers of the First Week)
The lenten services also make the undeniable point that we should not pride ourselves with external fasting since the devil also never eats!
The ascetic fast of Great Lent continues from Meatfare Sunday to Easter Sunday, and is broken only after the Paschal Divine Liturgy. Knowing the great effort to which they are called, Christians should make every effort to fast as well as they can, in secret, so that God would see and bless their openly with a holy life. Each person most do his best in the light of the given ideal." (my emphasis)
So, at least in the OCA, the burden is shifted to each individual believer. However, the rules are also important as they are the yardsticks that we must strive for, under the guidance of our spiritual fathers. I suppose to have a total fasting rule (dietary, prayer and alms giving) and to stick to it is much more important than to know the dietary fasting rules propagated by one's jurisdiction (and they are not uniform) or practiced by the circles that you are familiar with.