The Church for her part has specified certain forms of penance, both to ensure that the Catholic will do something, as required by divine law, while making it easy for Catholics to fulfill the obligation. Christ Himself said that His disciples would fast once He had departed (Lk. The general law of penance, therefore, is part of the law of God for man.
Thus, the 1983 Code of Canon Law specifies the obligations of Latin Rite Catholics [Eastern Rite Catholics have their own penitential practices as specified by the Code of Canons for the Eastern Churches].
Alcoholic beverages do not break the fast; however, they seem to be contrary to the spirit of doing penance.
Those who are excused from fast or abstinence Besides those outside the age limits, those of unsound mind, the sick, the frail, pregnant or nursing women according to need for meat or nourishment, manual laborers according to need, guests at a meal who cannot excuse themselves without giving great offense or causing enmity and other situations of moral or physical impossibility to observe the penitential discipline.
Some religious orders, as a penance, never eat meat.
Similarly, one could multiply the number of days that one fasted.