When I was at peak pain level during radiation I could not tolerate any fruits at all. I used to add milk to my formula (Fortisip) and some chocolate ice cream and syrup. A banana added was stingy and painful. Tinned peaches hurt. When taste went the chocolate enriched Fortisip was the only thing I could tolerate. I didn't look to see if Fortisip had corn syrup but it sure did the trick in getting me through radiation with minimal weight loss and bearable side effects. I lived on it for a few months and felt fine without any normal food. A live-wire member of my local support group survives on it alone. I hope it isn't contributing to the destruction of the rain forests but when your health is on the line it seems sensible to consume what the dietician recommends. As for the health effects of the these artificial substances .... Hmmmm. In the grand scheme of things, we have cancer, the treatment is brutal, and if we want to survive we have to allow ourselves to be zapped by radiation and poisoned by toxic chemicals.
As for my diet now, I'm not so proud of it. My blender and juicer get a workout but I need to add more vegetables to my diet.