I worked with the dietitian from the Mayo clinic. She told me I needed lots of extra calories, 2500 per day, and extra protein, 120 grams per day. The best advice she gave me to meet these requirements was not to eat anything that didn't contribute towards the calories or the protein requirements. She reminded me that the treatment was a relatively short period of time, not to worry about balance diets, healthy eating etc. So for me, I took that advice to heart, eating whatever I could swallow and during treatment, I only lost 8 pounds.