I agree with what Tamara said. It pretty much just falls off if you go strict paleo/primal.
The insipid "whole grain, low fat" thing seems to be quite antiquated, and nearly anyone who has tried it didn't have great results unless they were severely restricting calories. And even that will hit a wall.
Losing body fat is really a lot easier than I ever imagined. Strict paleo, lift heavy a couple times a week, sprint a couple times a week, and walk first thing in the morning a couple times a week and it will melt off.
Oh, and the Zone is stupid.