Without agreeing with the GP about diet and cancer, the rationale for diet-based approaches is the observation that most cancer cells shift energy production to

Without agreeing with the GP about diet and cancer, the rationale for diet-based approaches is the observation that most cancer cells shift energy production to glycolysis. This is known as the Warburg Effect (https://en.wikipedia.org/wiki/Warburg_effect https://en.wikipedia.org/wiki/Warburg_effect). Several theories have been put forward to explain this effect, I favor the mitochondria/apoptosis link.