What do you think of when you hear the word, "fasting?"
Having to give up certain foods?
If you check the Bible for details on fasting, you will find kings and prophets fasting with a purpose—the purpose of clearing their minds, and their stomachs, so they could be in a position to hear from God to receive direction for decisions they were facing.
You will also find God’s people being directed to fast in preparation for God’s hand to move.
And patients preparing for a medical procedure are often required to fast, or not eat after midnight, before going into surgery or having bloodwork done.