I have had a family member die of pancreatic cancer before age 60. It is, of course, terrible beyond belief. I'm not sure what you mean by "SOP" in this context. Referencing a bio-plausible mechanism is not actually clinically meaningful. It can provide a direction for study, but does not replace an actual clinical trial. As I said, "a patient can try anything they want".

But since we don't actually know whether such a recommendation will harm or help any individual patient, no one should be taking this recommendation as advice, and at the very least you should not be "highly recommending" specific dietary changes to people based on one anecdotal experience.