The Bible recounts primarily two types of fasts. A partial fast is described in the book of Daniel. Although the water fast seemed to be the custom of the prophet, there was a three-week period in which he only abstained from “delicacies,” meat, and wine (Daniel 10:3).
The two primary types mentioned in the Bible are the “absolute” and “supernatural absolute” fasts. These are total fasts-no food (solid or liquid) and no water. Paul went on an absolute fast for three days following his encounter with Jesus on the road to Damascus (Acts 9:9). Moses and Elijah engaged in what must be considered a supernatural absolute fast of forty days (Deuteronomy 9:9; I Kings 19:8).
If God leads you to undertake an absolute fast, you should obey. If so, be certain, without doubt, that God is leading you.
Water-only fasts that last for more than several days need to be undertaken with complete rest and under medical supervision because of the extreme danger of overtoxification, breakdown of vital body tissues, and loss of electrolytes.
For this reasons, water and juice fasting is often recommended, especially if one is going to fast for an extended period of time. This type of fast will provide you with more energy than absolute or water-only fasts and still lead you into the humbling experience of denying your desire for solid food that you can chew.
When it comes to making your final decision about what type of fast is right for you, follow the leading of the Holy Spirit. He will guide your heart and mind as to what is best for you. Remember, the most important consideration in fasting is your motive. Why are you fasting? To seek something personally from God’s hand or to seek His face in worship, praise and thanksgiving?