I recently listened to this Diary of a CEO podcast episode [1] discussing the potential link between blood glucose from carbohydrate-heavy diets and cancer. It is an alternate metabolic theory of cancer, and the podcast guest claimed that fasting followed by a keto diet was showing early success as an intervention for cancer patients (as an addition, not a replacement, to existing standard of care). I have not seen the data nor do I know the sample size, but the discussion convinced me to rethink my carb intake.

[1] https://www.youtube.com/watch?v=VaVC3PAWqLk