Hi Bear - interesting post. I'm a fiber skeptic and I believe that grains and legumes are deleterious to human health, but to extend that to vegetables, fruit, seeds and nuts is throwing out the baby with the bathwater.

Given the existance of modern hunter/gatherer peoples who do, indeed, eat vegetation; I'd have a hard time believing that our paleolithic ancestors shunned it completely. I can't imagine a caveman wandering around in spring not partaking in the bounty of berries, for example. Our sweet tooth had to evolve at some point, on something other than honey.