Fasting is one of the pillars of Lent and it provides a usignificant means of helping us listen to the Lord. It is a form of self-denial as we grow in our ability to say no to self and yes to God. Fasting provides a spiritual cleansing where we “make room” in our souls for God. This also provides an opportunity to allow the things that are hidden to move to the surface to be exposed to God’s grace and mercy. Things move from darkness to the light of Christ.
Ultimately, the purpose of fasting is to help us focus on God; to hunger for His presence and to listen to His words.
The great St. Augustine provides the merits of fasting, especially for those living a life of celibacy: “Fasting purifies the soul. It lifts up the mind and brings the body into subjection to the spirit. It makes the heart contrite and humble, scatters the clouds of desire, puts out the flames of lust and enkindles the true light of chastity.”
The following is provided from the Code of Canon Law for your information.
Can.1251 Abstinence from meat, or from some other food as determined by the Episcopal Conference, is to be observed on all Fridays, unless a solemnity should fall on a Friday. Abstinence and fasting are to be observed on Ash Wednesday and Good Friday.
Can.1252 The law of abstinence binds those who have completed their fourteenth year. The law of fasting binds those who have attained their majority (age 18 " C.97), until the beginning of their sixtieth year. Pastors of souls and parents are to ensure that even those who by reason of their age are not bound by the law of fasting and abstinence, are taught the true meaning of penance.
The law of abstinence forbids the use of meat, but not of eggs, the products of milk or condiments made of animal fat.