I’m not sure why praying and eating tend to go together. It’s not a Bible command (though we do have examples of Jesus and others thanking God for food). My best guess is that sitting down together at the table reminds us again of the many good things in our lives. Prayer is a natural expression of gratitude.
An old name for the Lord’s Supper is eucharist (Catholics, Anglicans, and others still call it that). Eucharist is simply the Greek word for “thanksgiving.” Communion, like our mealtime prayers, is a way of saying “Thank you” to God.
When we come to this Table together, we have much to be thankful for. We are thankful that God’s thrown open his arms to welcome us back into God’s family. We’re thankful for the spilt blood and broken body of Jesus that made us a Way home. We’re thankful that we’re here together, brothers and sisters sharing a meal. We take this bread, take this cup, as joyful acts of praise and thanksgiving.