In the Bible there is a tendency for resurrected people to eat. Consider the following verses:

Luke 24:41-43 And while they still disbelieved for joy and were marveling, he said to them, “Have you anything here to eat?” They gave him a piece of broiled fish, and he took it and ate before them.

Luke 8:54-55 But taking her by the hand he called, saying, “Child, arise.” And her spirit returned, and she got up at once. And he directed that something should be given her to eat.

Luke 24:40-43 And when he had said this, he showed them his hands and his feet. And while they still disbelieved for joy and were marveling, he said to them, “Have you anything here to eat?” They gave him a piece of broiled fish, and he took it and ate before them.

John 11:39 Jesus said, “Take away the stone.” Martha, the sister of the dead man, said to him, “Lord, by this time there will be an odor, for he has been dead four days.”

John 11:43-44 When he had said these things, he cried out with a loud voice, “Lazarus, come out.” The man who had died came out, his hands and feet bound with linen strips, and his face wrapped with a cloth. Jesus said to them, “Unbind him, and let him go.”

John 12:1-2 Six days before ithe Passover, Jesus therefore came to Bethany, where Lazarus was, whom Jesus had raised from the dead. So they gave a dinner for him there. Martha served, and Lazarus was one of those reclining with him at the table.

It doesn’t happen in every instance, but it does happen often enough to make you wonder what is going on. Are people still hungry after they die? Well, maybe, but I think there is a little bit more behind it. It seems that spirits (including angels) cannot eat food. In Genesis 18 when Abraham is visited by angels, he sets food before them (v 8) [EDIT: Actually, yes it does say they ate right there in verse 8!] but it doesn’t say that they ate it. They begin talking to him, not eating. In Judges 13 at the announcement of the birth of Samson, the angel who tells Manoah and his wife about Samson refuses to eat food offered him (v 16).

There is extra biblical evidence as well. In the apocryphal book of Tobit, the angel Raphael who had visited Tobit and helped him finally reveals himself as an angel at the end of the story. He says “All these days I did appear to you; but I neither ate nor drank, but you saw a vision.”

I think the reason that people are given food after they are resurrected is to prove that they are really alive, that it isn’t a ghost or an angel. The resurrection will be literal and physical. Our bodies will be reanimated and renewed. Freed from sin.