I am five years out and have to watch what I eat to remain slim. However, for the first year or perhaps 18 months following the rad and chemo, I ate like a linebacker and gained not an ounce. I, of course, was delighted to have that kind of metabolism (grin). I felt great and had plenty of energy. Then it was like a switch was flipped and I began to gain weight. Now I am back to normal, where I have to be very careful about what I eat, lest I gain. My take on this is if you feel good, enjoy it while it lasts. I kind of looked on it as a small payback for the misery and did not question my good fortune.