I really wonder about the biographies of people like this.
Like, a lot of people get to, "Huh, a lot of the nutritional/medical stuff we're told turns out to be not 100% right" pretty easy, and stay reasonable. Some people get to "...and that means that The Man is pushing bullshit and I should instead turn to chewing willow bark for my headaches," but just stick around there. Some people get to "...so I should latch onto this weird fad diet because it feels truthier to me," and stick there.
But these dudes go past all of those, straight into, "I should eat something that goes against not only everything experts and our culture in general have said, but also goes against my own bodily instincts, and the fact that it is causing me to feel extremely sick means it is working and I should do it more."
I just... I want to know what happens in a person's life to lead to that level of bloodymindedness