IMO, the huge problem with Mark's Primal Blueprint is his emphasis on fats and and his overall shunning of carbs. What matters is whole foods - a potato is just as healthy as an avocado. In fact, I am with Stephan Guyenet on this one - human life came from Equatorial regions, not the Arctic. The overwhelming majority of us are descendents of warm climates, which are noted for leaner game animals with plentiful starches and tubers. Look at current traditional societies that have not been Westernized - their staples are almost always carbohydrate based. It is NOT typical to find high fat traditional societies, but high carb is very, very common. This is a very interesting read.
Whole Health Source: Clarifications About Carbohydrate and Insulin
Think about it. Now, this doesn't make fat unhealthy - far from it - but I see the ideal human diet for most of us being plentiful in carbohydrate.
The big problem is that carbohydrate gets demonized because people with metabolic syndrome can't process carbohydrate anymore. It was never caused by carbohydrate. Metabolic syndrome is caused by chronic inflammation, not spiking your insulin. And how do you get chronically inflamed? Eating a diet rich in grains, processed vegetable oils, processed sugars, thickeners, chemical sweeteners, preservatives, etc. It has nothing to do with carbohydrate. It's like blaming your pencil for spelling words wrong.
Change things up. Drop your fats to the 50g range or so and start eating 300-400g of carbohydrate every day. Just make it from fruits, vegetables, tubers and the like, not from grains and refined sugars (though you can have some raw honey, organic maple syrup and blackstrap molasses in moderation). Focus on nutrient density. I feel far better eating leaner meats and carbohydrate than I do dropping carbs and eating fats. Fats are too calorically dense for me. I always overeat them before I feel full, and I get chubby fast eating them. Lean meats and starches, however, they fill me up fast and since carbs and protein isn't directly stored as fat, I maintain a much better body composition. I'm Italian - a Mediterranean climate by descent. Clearly, I am made for a more moderate approach and not a descendent of Nordics eating blubber.
For what it's worth, I probably eat around 25-30% of my calories from fat, 30-35% calories from protein and 35-40% calories from carbohydrate. My workout days are probably 50-60% carbohydrate with <20% fat.