Continuing with the previous - I guess I hit a key which sent it before I was ready
Juice 1 cup w/ sherbet 1/2 c, a scoop of whey powder
Variety and flavors you like are important. You can add fruit or whatever you take a whim to add.
With mouth sores, anything acidic may hurt so be careful.
Try to keep eating anything else you may like to try but this can put on weight. You do want to know if there is any malabsorption going on as this may have a major effect on ability to gain wt. If you can keep track of intake, using calorie and protein info from pkg or try using "mypyramid.gov" and obtain it from there.
Do not use this info without letting your treatment team know what you are doing so they can eval how it is working and let you know if any adjustments are needed for any particular problems that may be occurring. You may want to be sure there has not been an onset of diabetes - yes it has been known to occur.
If weight loss continues iv nutrition may be indicated, again check with your treatment team. It does come with some risks and special needs to be tended to.
Your nutrition treatment should be guided and further evaluated to be customized as your needs indicate; the information in this and the preceding mail are general recipes to try and do not allow for any other intolerance which may be occurring. If it creates probelms, don't continue with it. It also assumes no lactose intolerance, other intolerances or allergies.
I hope you find this helpful.