If you would like to look more into the question of fasting then I would recommend the book by John Piper, 'A HUNGER FOR GOD'.
This can be download for free as a pdf file from the DESIRING GOD website section on Books, or try using the following link:
http://document.desiringgod.org/a-hunger-for-god-en.pdf?1446646561
Two extracts:
"In other words, in this age there is an ache inside every
Christian that Jesus is not here as fully and intimately and as
powerfully and as gloriously as we want him to be. We hunger for so
much more. That is why we fast."
"We have tasted the powers of the age to come, and our fasting is
not because we are hungry for something we have not experienced, but
because the new wine of Christ’s presence is so real and so satisfying.
We must have all that it is possible to have. The newness of our fasting
is this: its intensity comes not because we have never tasted the wine of
Christ’s presence, but because we have tasted it so wonderfully by his
Spirit, and cannot now be satisfied until the consummation of joy arrives.
The new fasting, the Christian fasting, is a hunger for all the fullness
of God (Ephesians 3:19), aroused by the aroma of Jesus’ love and
by the taste of God’s goodness in the gospel of Christ (1 Peter 2:2–3)."
