"It is probably not breaking news that people’s eating decisions are not purely based on a careful reading of the scientific evidence. Better science is probably a necessary part of making the case but I do not think it will be sufficient to affect the type of change that many people in the ‘Paleo’ or ‘Ancestral Health’ communities (or whatever other term you prefer) would like to see. As mentioned, most people are averse to the notion that their beliefs are wrong and, in my experience, will try to come up with some reason for why that is not the case, sometimes resorting to questionable sources for support. This is human nature, I think—cognitive dissonance perhaps, to borrow a term from the psychologists. Based on what I can see, most people are not even willing to entertain the idea that there is a controversy or room for debate about these competing paradigms. Especially skinny people."