A personal point of view that has no scientific merit - 

Cancer and its treatments causes many people to have either a restricted diet or an inability to eat some or all foods due to changes in taste or lack of appetite.

I, for example am not only on a restricted diet due to stomas but I have a lack of appetite and an inability to eat stuff that I previously liked. I eat mostly chicken soup, though I've recently introduced minestrone. I try the occasional meal of fish with potatoes and cheese sauce an that's about it. Liver I can eat in small amounts. Oh and sweet stuff - jam roly-poly, rice pudding, ice cream.

My opinion then, after all that, eat what you want when you want. A caveat would be certain juices can affect medication, such as cranberry, grapefruit.

But cancer's enough without restricting stuff you might like.

Regards

Taff