I would say a century of study of this specific topic is "starting somewhere". Now, while I believe Zombie Feynman would go far, far more hungry in a group of nutritionists than he would in a group of string theorists, it doesn't mean that there isn't a lot more knowledge than what is contained in a single, undergrad text book (witness the lack of sulfur) that espouses thinking to has begun to be significantly altered by new science in the last decade. To completely ignore that isn't "starting somewhere", it's blindfolding yourself, spinning a few times, and stumbling off.

I'm all for experiments with n=1 in nutrition (I do it all the time), but call it what it is. Don't pretend that, even if it works for six months or a year on you, that you really have any info that is relevant to the rest of the world. Increasing his n with others is a good start, but it will still take 50 years or more to know if this stuff is poison or panacea.