It astonishes me that so many in the mainstream medical community aren't willing to go out on a limb in this one instance (where a healthful change can't possibly hinder one's treatment) and say, "Yes -- I think that the kind of fuel you put into your body matters. So eat lots of plants, don't eat lab chemicals, and buy organic everything if you can afford it."

I mean, the cancer center where I'm treated hands out Ensure! Lab chemicals and sugar out the wazoo.

In 2012-13, I experienced significant improvement bc of diet. I had developed pain and swelling in many of my joints (turned out to be an autoimmune disease); as I waited to be seen by a clinic (I had no insurance and had only PT work, thanks to the Great Recession), I cut most lab chemicals and most sugar, and I felt significantly better / had far less swelling.

Bc of some intense life stressors, I didn't stick with the improved diet -- but finally, in Nov. 2019, at age 58, I switched to a plant-based, almost-no-added-sugar, almost-zero-lab-chemicals diet, and I stuck with it for 3+ years. I firmly believe that my improved diet and mostly better health contributed to my having a reasonably easy time with a notoriously toxic chemo (FOLFIRINOX).

Yes, a good diet didn't prevent my cancer -- but there's a lot of cancer in my family (it killed 3 of the 9 in my parents' generation, and so far 4 of 14 of us in my generation on my mother's side have, or had, cancer), so I think my genetic predisposition, plus many years without healthcare, plus many years of mega-stress + poor sleep + mediocre diet, made it almost inevitable.

(Weirdly, after my symptoms exploded, in Jan. 2023, my taste buds changed 100%, and I've eaten not-so-well this past year -- but I'm finally regaining my former taste buds and gradually reverting to my former diet: lots of veg, beans, brown rice, steel-cut oats, some millet, some quinoa, some fruit, some tofu, some fish, some nut butters, a little dairy, and a little dark chocolate. Also, in case others have little prep time or a tiny budget, as do I, consider relying on frozen veg -- not as versatile as fresh, but I've read that they're equally nutritious.)

So, yes, go for a plant-based, whole-foods, no-lab-chemicals, low-or-no-sugar diet. And, organic whenever you can, preferably always. Good luck.

PS: I haven't yet read "How to Starve Cancer" by Jane McLelland, but it has been recommended.