What is a fast without the Word of God and prayer? The answer, is a diet. We need to fast in the same way we need baptism and communion. None of it has anything to do with our salvation but everything to do with obedience and relationship.
Fasting has no power in of itself but it is a tremendous instrument in changing us so that we are better focused on the lover of our soul. Now who wouldn't want that? But like the psalmist, we have to have a hunger and longing for the Word of God. Instead of filling our bellies with food, we are taking the time to fill our spirit on the Bread of Life.
Reading and studying the Word of God should never be a chore for those who love the Lord their God with all their heart, mind, should and strength. It is our sustenance. And we say with the psalmist:
"I meditate on your precepts and consider your ways. I delight in your decrees; I will not neglect your word." (Psalm 119:15-16)
As you fast, draw close to God by dwelling in his Word. Listen carefully to what he has to say directly to your heart. Don't allow your fast to be considered a diet but instead allow it to be what it is intended for, an instrument to hear clearly from God.