Fasting, or abstaining from food for spiritual purposes, is a practice often misunderstood by Christians. Since it is natural in times of great grief to lose the appetite, some have concluded that this is the fasting Jesus expected of his disciples after his departure.
History indicates that man in all ages and among all nations has engaged in fasting.
It has been used for many purposes including ceremonials, mourning, or as an aid to building self-control and as a method for gaining spiritual strength. Fasting like yours this day will not make your voice to be heard on high. Here, the Lord's people had turned to wickedness and the prophet was asked to refrain even from praying for them. Thus, fasting is not a substitute for righteousness. It is easy to understand why fasting is not popular today.