Luke 24:43

To convey therefore the truth of His resurrection, He condescends not only to be touched by His disciples, but to eat with them, that they might not suspect that His appearance was not actual, but only imaginary. Hence it follows, And when he had eaten before them, he took the remnant, and gave to them. He ate indeed by His power, not from necessity. The thirsty earth absorbs water in one way, the burning sun in another way, the one from want, the other from power.

He ate therefore after the resurrection, not as needing food, nor as signifying that the resurrection which we are expecting will need food; but that He might thereby build up the nature of a rising body.

But some one will say, If we allow that our Lord ate after His resurrection, let us also grant that all men will after the resurrection take the nourishment of food. But these things which for a certain purpose are done by our Saviour, are not the rule and measure of nature, since in other things He has purposed differently. For He will raise our bodies, not defective but perfect and incorrupt, who yet left on His own body the prints which the nails had made, and the wound in His side, in order to show that the nature of His body remained the same after the resurrection, and that He was not changed into another substance.