In his book simply titled, "FASTING", Pastor Jentezen Franklin reminds us that Satan hates when you pray with fasting. The Devil knows when you succeed in your endeavour you will be empowered to disrupt plans and destroy his strongholds. So he makes it his business to discourage you and distract you from your time of prayer and fasting.
Remember that Jesus preceded His earthly ministry with a 40-day season of prayer and fasting. Satan was determined to derail this part of Jesus' preparation for ministry. Before the fast was complete, the Devil cunningly suggested Jesus use His creative ability to turn stones into bread. And bread was one of the very things for which Jesus was, no doubt, hungry. But Jesus would not be derailed from His plan. He refused the temptation to put before Him something He determined to resist. Jesus knew that the benefits of a time of prayer and fasting would not be fully released until the 40 days were complete.
Satan will try, as he did with Jesus, to get you to focus on the increasing absence of your "bread" rather than the increasing presence of Christ's power! Don't lose your focus. Jesus didn't. And when He completed His time of prayer and fasting, the Scriptures state, "Then Jesus returned in the power of the Spirit ..."
At the end of your time of prayer and fasting, others will see you acting and speaking with clear evidence of the mighty power of the Holy Spirit working in you and through you.