jkoziel agrees with the teachings of the fathers. We are instructed by them to fast on Wednesdays (the day of Jesus betrayal) and Fridays (the day of His crucifixion). In addition, we are given extended periods of fasting (Advent, Lent, The Apostles Fast and The Dormition of the Theotokos).
It has been my experience that those who hold the opinion of smilewarrior, generally don't fast at any regular intervals, kinda hit and miss. That is not to say that smilewarrior falls into that category, but the argument does.
Peace.
Peter