The reason we do not eat meat on Good Friday is to honor and remember the sacrifice of Jesus Christ, who gave up his flesh on that day. Abstaining from eating flesh meat (such as beef, pork, chicken, and turkey) is a form of penance and self-denial, reflecting sorrow and contrition for sin and symbolizing solidarity with Jesus' suffering and sacrifice. Fish and other cold-blooded animals are not considered flesh meat and are therefore allowed. This practice has been observed since the early centuries of Christianity and is part of a broader tradition of fasting and abstinence on Fridays, particularly during Lent, to recognize Good Friday as the day of Jesus' crucifixion and ultimate sacrifice.