With all the discussion of carb levels in the Paleosphere, this seems timely; even though it is probably a flash from the past for many of you, it's new for me.
Fascinating & large study comparing Atkins, Govt recommended diet, Zone and Ornish diets. Conducted by Christopher Gardner, PhD at Stanford University. Lecture filmed in 2008.
He was a vegetarian of 25 years, and it is interesting watching him start his paradigm shift around saturated fats & grains. He even mentions a tiny Paleo vs Mediterranean diet study towards the end.