Eric is right about putting on the lean body mass, when you are ready to work on coming back. You can't do it without a good balance of hormones. My testosterone when through the basement a couple of years after treatment. I started wearing a patch to get the levels back to norm. I thought this really strange, as my family jewels were pretty far from my head and neck radiation. But your pituitary gland gets at least some scatter radiation with IMRT and really gets nuked with XMT that I had. It is the master and commander gland that controls all of your other ones� Eric you should get an 8 AM adrenal gland cortisol test as well.