As human animals, our genetic programming pushes us to optimize caloric intake with the minimal amount of effort expended. The food industry knows this, and has for decades been developing "foods" scientifically engineered to appeal to that evolutionary drive. That result? An explosion in obesity, chronic health conditions like diabetes, and a society shamed by itself.
Robb Wolf's guidance revolves around working with, not against, our primal wiring. Eating more, but of the fuel our body truly needs, is much better than merely eating less of the processed gunk sold to us in most aisles of the grocery store.