Why Do Christians Eat Bread And Wine In Holy Communion?

Jesus told his followers to eat bread and wine when they remember his death. The Apostle Paul said:

23 This is the message that I received from the Lord. I then told it to you.

This is what happened on the night that Jesus' enemies took hold of him. The Lord Jesus picked up some bread to eat with his disciples. 24 He thanked God for the bread and then he broke it into pieces. He said: ‘This is my body that I give to save you. Eat this bread, so that you remember me.’

25 After they had eaten supper, Jesus took a cup of wine. He spoke to his disciples again. He said, ‘This cup shows my blood that will pour out when I die. God now makes a new agreement to save people because of my death. Whenever you drink from the cup in this way, do it to remember me.’

26 Every time that you eat bread and you drink from the cup like this, you are showing something. You are showing people what the Lord's death means. You should continue to do this until he returns.

1 Corinthians 11:23-26 EasyEnglish Bible (EASY)

To read more about the Last Supper see Chapter 14 verses 22-24 of Mark's Gospel.