We live in a generation that is not new to fasting. When many people hear the word, the understanding they form is simple and it is to skip food for a period of time. But that understanding does not uncover the actual purpose of fasting.
When we fast, it implies that we are staying away from distractions and pleasures to seek the face of God. This means the end and purpose of our fast is to gain undivided focus in seeking the mind of God. It is shocking, however, that many Christians embark on fasts but leave out the most important part of the process: prayer.
As a Christian, you must understand that prayer is your way of communicating and interacting with God. It is in this communication called prayer that we speak our hearts to God, and God reveals His heart to us. So, if fasting is staying away from distractions to seek the face of God, then it is important to note that prayer is not optional to the process. It is integral to it.
 Jesus Himself talks about this when He said, "This kind does not go out except by prayer and fasting" (Matthew 17:21). He was showing us that fasting and prayer is never meant to stand alone. Instead, they work together.
Think of it like this: fasting helps you turn down the noise, and it is with prayer that you turn up your voice and your heart to God.When you fast, God is expecting to hear from you. Sadly, many Christians are only counting down the hours until the appointed time to break the fast so they can eat again. That makes the process incomplete. You can starve your body and still starve the very purpose the fast was meant to achieve, because starving the body is not the point.
So, the next time you fast, make sure you set aside specific times to pray. This is the pattern Daniel followed when he turned to the Lord "to seek him by prayer and petitions, in fasting" (Daniel 9:3). He did not simply abstain from food and wait. He set his heart to pray, and it was in that place of prayer that heaven responded to him.
 Decide what you are seeking, whether it is direction, breakthrough, repentance, or simply a deeper hunger for God. Set fixed times to pray during the fast rather than letting the hours pass in hunger alone. 
Remember, the Bible says, "Ask, and it will be given to you; seek, and you will find; knock, and it will be opened to you" (Matthew 7:7).

In conclusion, your body becoming weak when you fast is not what impresses God. So do not be like many who equate the level of the weakness they experience when they fast to how mean they have impressed God. However, it is what your voice and heart communicate to Him that matters the most.