A Regular Fast – traditionally, a regular fast means refraining from eating all food. Most people still drink water or juice during a regular fast. When Jesus fasted in the desert, the Bible says, "...after fasting 40 days and 40 nights, He was hungry." This verse does not mention Jesus being thirsty.
A Partial Fast –This type of fast generally refers to omitting a specific meal from your diet or refraining from certain types of foods. Daniel 10:2-3 says, "At that time I, Daniel, mourned for three weeks. I ate no choice food; no meat or wine touched my lips; and I used no lotions at all until the three weeks were over." In Daniel 1:12. They restricted their diet to vegetables and water: "Please test your servants for 10 days, give us nothing but vegetables to eat and water to drink."
A Full Fast – these fasts are complete – no food and no drink. Acts 9:9 describes when Paul went on a full fast for three days following his encounter with Jesus on the road to Damascus: "For three days he was blind, and did not eat or drink anything." Esther sent this reply to Mordecai: "Go, gather together all of the Jews who are in Susa, and fast for me. Do you not eat or drink for three days, night or day. I and my maids will fast as you do. When this is done, I will go to the king, even though it is against the law. And if I perish, I perish." It is recommended that this type of fast be done with extreme caution and not for extended periods of time.