Hate to make your head spin more, but the recent proponents of a carnivore diet, and the many anti-fiber folks who have been writing for years, dispute the claims that fiber has any benefit for cancer, or anything else.

This page is loaded with the science on carnivore diets, and by default, the papers why vegetables are not "healthy" http://justmeat.co

I have listened to so many podcasts lately on the topic, but think it may have come up with Dr Shawn Baker on the Human Performance Outlier Interview with Dr Georgia Edes, and Robb Wolf's Interview with Amber O'Hearn. I think some other of Shawn's guests discussed the microbiome and cancer.