Fasting has been around for centuries and is found in both the Old and New Testament.  Jesus fasted often and is recommended in times of great temptation or severe trials.  Well known as an acceptable sacrifice to offer God.  In Mt 9:14-15, Christ wanted his disciples to fast and pray and gave us clear instructions for how they should do so (Mt 6:16-18). Today, Catholics follow this pattern of fasting and abstinence from certain foods as stated in Daniel 10:2-3.

In recent Marian apparitions in Medjugorje, Mary has asked us to fast on bread and water on Wednesdays and Fridays (preferably from Wednesday midnight to Friday midnight).  The amounts of bread and water are not specified; however, it is known to be a sacrifice or offering to God.

If this is not possible due to sickness or some other reason, then Our Lady asks that we at least give up something to make a sacrifice to God. 

So why should we fast?  Jesus tells us in Mark 9:29 that certain devils, "can be cast out in no other way except by prayer and fasting".  We have to realize the power of fasting.  In recent messages from Our Lady, she tells us "You have forgotten that with prayer and fasting you can ward off wars, suspend natural laws." 

By combining prayer with fasting we increase the power and efficacy of our prayers.  This is especially important to remember when praying for a special or urgent intention. By prayer and fasting we allow our whole being to participate, and offer this sacrifice to God. We should also fast because we love God and want to be soldiers that offer our bodies in the battle against evil.