I will start by saying, I have been paleo for 1.5 years and firmly believe it is the healthiest way to eat. However, often when I talk about it with friends/family, they say it sounds like a cult. Mostly jokingly, but there's always some truth to humor. I am happy to discuss/debate the merits of the paleo approach with them, but as I think back, my side of the discussion often ends with (even if I'm not willing to admit it to them) "because I read it on KGH's blog or Stephan's blog or wherever."
Realistically, I don't fully understand the biochemistry behind why polyunsaturated fat is more likely to oxidize in the human body. I don't fully understand how omega 6 and omega 3 compete with each other for use in the body. And if I'm not willing to invest the time/resources and/or don't have the capability/understanding to really figure out those things for myself, the best I can do is find others who are willing to do the research/thinking for me. Then, read as many different views as I can, pick the ones that seem most reasonable/believable and synthesize across them as best I can. If I'm really pushed, isn't that faith?
Yes, there is always the argument that I feel better since I've switched to this way of eating, but I've heard the same from people on almost any diet (e.g., vegans). There are so many things that affect "feeling better" (exercise, stress, etc) and I'm sure just being thoughtful about what you are eating through almost any diet can be helpful, that I don't think it's good enough proof. Also, feeling better now is not definitive evidence that this way of eating is best in the long run.
And, there is the argument that the simple logic behind paleo just makes sense. I.e., our decision of what to eat is informed by the types of foods that we likely encountered as we were evolving. But, many years ago, I would have said that eating low fat just makes sense. You don't want to be fat, then don't eat fat. And, not too long ago, the carbohydrate hypothesis made sense. So I think the simple logic is not enough either.
I personally do think there is more to it than just faith, but I would imagine anyone who has real faith in something, wouldn't call it faith either. They would just call it the truth. So... what do you think? Does making the decision to adopt a more paleo lifestyle really come down to faith in the end?
And I guess the follow-up question that someone will post in the comments anyway, who cares?