Well, it seems that casein is also not very well tolerated among rawfooders (ex : many primaldieters give up dairy).
Dairy is a common food on the SAD diet, how can you be sure that casein in dairy does not also induce gut permeability (Seignalet diet excludes dairy for this reason) ?
Well, I'll probably get crucified for saying this, but I get a little tired of hearing about some mystical sect of Primal Dieters that have gone off dairy. Theres probably a chunk of folks that become disillusioned with AV or just choose to simplify things, but there are also very long term Primals that have improved their health and probably have levels of health many people here would be happy to have. I think its fine from a paleo perspective to surmise that some would be better without dairy, or similar such statements, but the only PrD folks I have spoken to are pretty thrilled about their raw-dairy even in the long-term. I don't think it has anything to do with taste or being squeemish about animal fats for long term people that also do high-meats, intestines, rotten chicken etc... Another point to be crucified for on the above is myself and many others who have tried or implemented dairy in the shorter term say 6mo-2 years, have mentioned cold flu/like mucus and other symptoms which eventually went away. I know I had some mucus and such and some odor, but when I think about my past, I was never hugely dairy heavy and would hack up mucus daily in the shower every morning and always get flus, yet .5 lb of pure dairy fat yielded maybe a spits worth here and there which went away, doesn't quite add up to me.
I've never experienced any direct negatives from raw-dairy (butter), in fact only positives like better bowel function and better digestion. It could be that because of other factors like mag/cal ratio or other things that it has other affects that are hard to pinpoint or that it indeed stalls or worsens progress, but these seem to be impossible to measure without major long term self-trials. All I can say is when I try do weeks of just meat and animal fat, my bowels suffer somewhat, and I also have a hard time taking in enough fat and greatly under eat. There is 100% certainty on my part that raw butter digests faster than raw suet which seems to sit in my stomach for hours at least, I would probably throw 'better' into that as well but of course am not as sure on that one. Perhaps for people eating fruits this isn't as big a deal, but have found meat+marrow does not cut it so I'm going back to butter myself.
another thing in linking to foods that mimic our original nutrition as opposed to foods we would eat, I have found butter to be very hydrating and soothing, and frozen kidney fat to be incredibly dehydrating, needing far much more water than I usually consume in an almost unrealistic quantity. With the fat attached on fresh fatty muscle meat being an ideal, and butter being alot closer to me than dried kidney fat.