Mark's Daily Apple blog seems to be very popular among Paleo/Primal folks.
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But I know what you mean about the confusion. I started looking into low-carb after reading Gary Taubes' book and soon become overwhelmed with the many varieties of diet out there (many you listed). To help myself wade through it I asked myself what my goals were, what I felt my specific eating issues were, and went from there.Â
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For example, I have no health problems so a diet specific to, say, Crohn's Disease, didn't have to sit high on my radar. On the other hand, I want to shed some excess pounds. My huge eating issue is sugar, I have cravings, ups and downs, etc. So cutting out sugar was important to me. My love of sugar means I also love grains - I'd have meals that were mostly rice and then wonder why I would be hungry later on and craving sugars. So I decided to cut out grains. With respect to dairy, I've never had any trouble with it (nor has anyone in our family) and we have access to raw milk from which I make yogurt and butter, so I did not want to give that up. Finally, I knew any attempts at weighing food, counting calories, or otherwise getting obsessive about eating or exercising would not work with me. BTDT and gave it up as too much work (and frankly, too much thinking about food). I exercise regularly just with my lifestyle (we live on an acreage and there are many labour-intensive projects; plus I have a high-energy dog who needs walks and bike rides) and was not interested in trying to exercise just for the sake of exercising.
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With all these on my list of goals the paleo/primal diets were closest to what I was looking for, so that's what I focussed on. You may come to a different conclusion. And I think that's Okay. I don't want to get all religious about diet and I'm sure that what works for some may not work for all.