Why we are fasting determines which type of fast to consider. Are we fating to grow intimate with God? Are we fasting to be more effective in our prayer life? Do we want to get rid of (essentially kill) a habit in our life or get over a past relationship that won’t leave our heart? Do we want to start something new in our lives? Do we want to seek an answer for God’s heart for direction in our lives? What we want to accomplish might suggest how we go about fasting.
Success at fasting also depends on what kind of an eating schedule one has options for. If one has many social obligations around food, it’s hard to fast during public moments and not say anything. Fating is not about drawing attention to oneself.
God notices whatever sacrifice we make with our eating patterns. If we give up one meal a day, no one might notice and we go through a small blood sugar lull. But our bodies don’t really suffer. We might have to watch our attitude and not snap at people. These are doable and can be effective in praying for specific answers to prayer, or interceding for others. We join them in our fasting with them.
More dramatic is to give up food for a day, or two or three days. This can be done with a water-only fast or with a juice fast. Juices are good for multiple days since the body can get nutrients and vitamins, even at a minimal level. One gets plenty hungry, but the body does fine. These can be very effective for people who are in deliverance ministries and/or healing ministries. It increases authority in the spiritual realm. It also brings us closer to God. Some people do these kinds of one day fasts routinely to keep themselves ready for when God asks them to pray deliverance prayers.