I would argue that low fat may work well -- but it is not sustainable for many people.

And I totally agree that this discussion needs to acknowledge that it all works differently for people with different biochemistries -- I was responding, in my previous post, as a metabolic-disorder person. For me, low fat worked, but wasn't sustainable. Moderation did not work. Low carb works and so far has been very easy to sustain. For me. Yes, YMMV