Thanks Amy for your reply - it helps knowing somethings are to be expected. He was originally on Nutren supplement but it was too rich. He does drink an occasional Boost or Ensure. I went to the health food store and bought a high calorie/vitamin powder to mix with milk. I hope this will be OK to give him. He had stopped RAD for approx 2 1/2 wks due to him being in the hospital. The Dr added 4 treatments because of the lapse in time which he completed in 8days. He now says his tongue seems to be swollen and painful. But we are wondering why becasue he did not have RAD for awhile and then only 8 sessions in succession. Any ideas?