[abainbridge]

I think their claim is that most carbs are mostly made out of D-glucose. And that excessive amounts of it cause your insulin based signalling cascade to go wrong.

I'm sure that encapsulating your carbs in a nice hard-to-unwrap cellulose structure slows the release of this D-glucose stuff and gives your body's control loop more chance to cope. But at this point we're arguing about the details of the causal link.