His assertion is that he current method of treating diabetes is based on classical mechanics, 1-in-1-out, etc., where you measure your blood sugar and try to manually maintain it at a certain level with sugar and insulin.
But ...
1) the human body is a complex, non-linear, dynamic system. It is based on and responds to signalling, genetic triggers, etc., and ...
2) you don't need to micromanage your body, it will take care of itself as long as you don't essentially poison it.
3) the old method presumes there is something wrong with your body, when in actuality, the problem is with the way your body reacts to 'modern' (post-agricultural) foods. Diabetes is a symptom of that, so cut those foods out, and diabetes goes away.
It may not apply to all types of diabetes, IANAE, but seriously, stop by a bookstore and spend 20m reading just the first chapter (maybe 2, can't recall exactly), and figure out if it's something worth looking into further.
1. http://www.amazon.com/The-New-Evolution-Diet-Paleolithic/dp/...