1700 calories a day seems like a low number to me. Going through treatment requires lots of energy. I've been aiming for 2500 calories or more per day. That being said, I do not have mouth sores yet. 9 radiation treatments in.

Nutritional drinks like Boost or Ensure have protein and many other vitamins and minerals we need. You can try using them (or milk) when making Oatmeal or Cream of Wheat for extra protein.

Do you wear dental guards during radiation?