i personally can't answer a lot of it but i can say my diet i added a lot of mushrooms (things like lions mane oyster, chestnut, etc i'd get from local mushroom growers NOT the white ones from the store) and shellfish (especially oysters and scallops) which helped with the metallic taste i get while on chemo...this go around i've found myself craving blackberries, generally i follow what my body craves or can tolerate,,,
my current supplements are zinc, magnesium, essiac, cranberry, turmeric, and b17, but that does occasionally change up depending on how i'm feeling... i'm hoping the zinc will help with the rebuilding on my neutrophils to actually allow me to get chemo next week...its a new trial thing i'm doing... i did not cut out sugar or anything else...but thats me personally...i just find i don't crave sweets right now and i've found acupuncture to be invaluable in helping manage nausea etc, never had radiation so no help there
hope that helps diet wise...