There are different degrees of fasting that have been passed down to us . Remember these are not laws or rules that we are to blindly follow but are proven practices that can help us come closer to God. Orthodoxy is not legalistic or rule oriented. The rules or guidelines that have been established for us are there for our spiritual benefit. We have to use them with the appropriate attitude to receive the benefit. In this matter be sure to follow the guidance of your spiritual father. We must beware of putting too much attention on the physical aspects before we have matured in our inner work because this can lead us to thinking that we do all the work and then forget that is the grace of God that we are trying to come in union with and to follow. We can become proud of our physical achievements and lose our contact with God because of our sinfulness aamd self-centeredness. Fasting is not a contest but it is an important self-discipline that will help us come closer to God when practiced with the proper attitude.