Fasting like so many other things in Scripture, is a physical symbol of a spiritual reality. The withholding of food from the body is of no spiritual value unless its done deliberately when we desire nothing but to seek God.
Absolute Fast : -No food or drink
Normal Fast: Limited Time
Patial Fast: Limited Diet
I have esteemed the words of his mouth more than my necessary food(Job 23:12).
Please Read these Scriptures and Meditate on what God is saying to you.
Ask God to be sensitive to His Spirit as you seek to draw closer to Him and to purify and bless you and others because of Him.