Orthodox Christians following the Old Church Calendar begin the Nativity Fast today, also known as the Christmas Fast. The fast lasts for 40 days and will conclude on January 7, the celebration of the Nativity of Christ. For those adhering to the New Calendar, the fast began two weeks ago and will end on December 25, IPN reports.

The Church teaches that the Nativity Fast symbolizes the forty days of fasting by the Prophet Moses, as well as the fasting of the patriarchs of the Old Testament who awaited the coming of a Savior.

During the fast, Christians abstain from animal-based foods. Unlike the stricter Great Lent, this fast permits the consumption of fish, oil, and wine on Saturdays, Sundays, and feast days.

Beyond dietary restrictions, the moral and spiritual aspects of the fast should not be overlooked. The purpose of fasting is to purify the mind and soul to prepare for the dwelling of Christ. Christians are encouraged to be merciful and to overcome anger, hatred, jealousy, malice, greed, and selfishness.

Those wishing to partake in Holy Communion may do so every weekend and on feast days, when liturgies are performed. On the final day of the fast, Christmas Eve, a strict fast is observed until the first star appears in the sky. Exceptions are made during the fast for children, pregnant women, nursing mothers, students, the sick, and travelers.

Throughout the year, there are four fasting periods: the Great Lent (Lenten Fast), the Nativity Fast, the Dormition Fast (in honor of the Virgin Mary), and the Apostles' Fast (dedicated to Saints Peter and Paul).