Objection 1. It seems that Christ's body did not rise glorified. For glorified bodies shine, according to Matthew 13:43: "Then shall the just shine as the sun in the kingdom of their Father." But shining bodies are seen under the aspect of light, but not of color. Therefore, since Christ's body was beheld under the aspect of color, as it had been hitherto, it seems that it was not a glorified one.
Objection 2. Further, a glorified body is incorruptible. But Christ's body seems not to have been incorruptible; because it was palpable, as He Himself says in Luke 24:39: "Handle, and see." Now Gregory says (Hom. in Evang. xxvi) that "what is handled must be corruptible, and that which is incorruptible cannot be handled." Consequently, Christ's body was not glorified.
Objection 3. Further, a glorified body is not animal, but spiritual, as is clear from 1 Corinthians 15. But after the Resurrection Christ's body seems to have been animal, since He ate and drank with His disciples, as we read in the closing chapters of Luke and John. Therefore, it seems that Christ's body was not glorified.
On the contrary, The Apostle says (Philippians 3:21): "He will reform the body of our lowness, made like to the body of His glory."
I answer that, Christ's was a glorified body in His Resurrection, and this is evident from three reasons. First of all, because His Resurrection was the exemplar and the cause of ours, as is stated in 1 Corinthians 15:43. But in the resurrection the saints will have glorified bodies, as is written in the same place: "It is sown in dishonor, it shall rise in glory." Hence, since the cause is mightier than the effect, and the exemplar than the exemplate; much more glorious, then, was the body of Christ in His Resurrection. Secondly, because He merited the glory of His Resurrection by the lowliness of His Passion. Hence He said (John 12:27): "Now is My soul troubled," which refers to the Passion; and later He adds: "Father, glorify Thy name," whereby He asks for the glory of the Resurrection. Thirdly, because as stated above (Question 34, Article 4), Christ's soul was glorified from the instant of His conception by perfect fruition of the Godhead. But, as stated above (14, 1, ad 2), it was owing to the Divine economy that the glory did not pass from His soul to His body, in order that by the Passion He might accomplish the mystery of our redemption. Consequently, when this mystery of Christ's Passion and death was finished, straightway the soul communicated its glory to the risen body in the Resurrection; and so that body was made glorious.
Reply to Objection 1. Whatever is received within a subject is received according to the subject's capacity. Therefore, since glory flows from the soul into the body, it follows that, as Augustine says (Ep. ad Dioscor. cxviii), the brightness or splendor of a glorified body is after the manner of natural color in the human body; just as variously colored glass derives its splendor from the sun's radiance, according to the mode of the color. But as it lies within the power of a glorified man whether his body be seen or not, as stated above (1, ad 2), so is it in his power whether its splendor be seen or not. Accordingly it can be seen in its color without its brightness. And it was in this way that Christ's body appeared to the disciples after the Resurrection.
Reply to Objection 2. We say that a body can be handled not only because of its resistance, but also on account of its density. But from rarity and density follow weight and lightness, heat and cold, and similar contraries, which are the principles of corruption in elementary bodies. Consequently, a body that can be handled by human touch is naturally corruptible. But if there be a body that resists touch, and yet is not disposed according to the qualities mentioned, which are the proper objects of human touch, such as a heavenly body, then such body cannot be said to be handled. But Christ's body after the Resurrection was truly made up of elements, and had tangible qualities such as the nature of a human body requires, and therefore it could naturally be handled; and if it had nothing beyond the nature of a human body, it would likewise be corruptible. But it had something else which made it incorruptible, and this was not the nature of a heavenly body, as some maintain, and into which we shall make fuller inquiry later (XP, 82, 1), but it was glory flowing from a beatified soul: because, as Augustine says (Ep. ad Dioscor. cxviii): "God made the soul of such powerful nature, that from its fullest beatitude the fulness of health overflows into the body, that is, the vigor of incorruption." And therefore Gregory says (Hom. in Evang. xxvi): "Christ's body is shown to be of the same nature, but of different glory, after the Resurrection."
Reply to Objection 3. As Augustine says (De Civ. Dei xiii): "After the Resurrection, our Saviour in spiritual but true flesh partook of meat with the disciples, not from need of food, but because it lay in His power." For as Bede says on Luke 24:41: "The thirsty earth sucks in the water, and the sun's burning ray absorbs it; the former from need, the latter by its power." Hence after the Resurrection He ate, "not as needing food, but in order thus to show the nature of His risen body." Nor does it follow that His was an animal body that stands in need of food.
Source: Summa Theologica (New Advent)