I've been a naturopath at heart for a couple of decades now, so the the primal/paleo way of life is a good fit for my philosophy.
It all makes perfect sense to me. I already understood all the stuff about metabolism, but was unaware of the anti-nutrients in non-gluten grains and legumes, problems with the casein in cow's dairy, and how important omega 3:6 ratio is. I'd been gluten-free for about 5 years previously. The major benefit for me has been making my diet less inflammatory, with eczema now under control and recurrent sinus infections have gone. Chronic rhinitis also much improved.
I like the idea of emulating the kind of activity that paleo man/woman would have done, and the emphasis on building lean mass and strength, and doing low-level cardio.
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.