What exactly are paleolithic forms of carbs?

[surfsteve]

Without reading through the entire thread I'd have to say the answer to the question in the title is rather obvious.

Paleo carbs consisted mainly of FIBER, meaning that the vast majority of carbs passed right through undigested.

Rather than being a direct source of nutrition, carbs made of fiber serve mainly as a place for the gut flora's microbes to live and in some cases as their food source. These microbes yield themselves as a secondary food source, packed with nutrition and health benefits for the consumer of the original fiber. 

[Projectile Vomit]

Some of the microbe's metabolites are nutritionally valuable too.