Discipleship is training-not sacrificing. You will find more mileage with the "sacrifice of praise" then you will with training. That is because the ONLY thing we can offer to God is our praise. Everything else comes from God.
If we resist the temptation to eat food during a fast, this will enable us to more easily reist other temptations that come to us outside our control.
And right here is the problem with this whole thing. If we resist this will enable us to... Where precisely are we depending on the Lord? We are solely dependent upon Christ our Lord, day by day, through all circumstances. Without Christ, we can do nothing.
Anyone who trains to win sacrifices for it.