This is a quote from Dr. Davis' post by Dr. Andreas Eenfel:
If you instead substitute bread for
the butter, calorie for calorie, the
insulin levels would shoot through the
roof. In other words, if eating more
butter makes you eat less bread, that
will surely make you thinner, not fat.
That seems to be the way it works for
me and my patients. I eat more butter
than ever, more than most people, and
I am as thin at 38 as when I was 20.
Butter probably does cause an insulin response from looking at the evidence, but looking at Peter's article cited by Partrik, it is much much more complex than that. In short, the arguments could go back and forth forever, but I do not think we should be overly concerned about cutting out every item of insulinogenic food from our diets.
Here in the Alps where I live, butter was sacred and candles of butter were burned in church to bless the cows right up until the 1950's. The inhabitants of these valleys were healthy, svelt and happy and very high butter consumers, as there was not much else to eat (in winter especially).
To start with, I thought this quote above was irrelevant, but it is actually very relevant; if you are eating (pastured) butter instead of the other insulinogenic foods out there, then consuming it in moderation - as we should with all foods - gives us some important vitamins, minerals and activators that I think we shouldn't dismiss just because it raises insulin levels.
My personal experience is that I put on no weight if I eat butter in moderation (but this may not be the case for people who have challenges with insulin sensitivity, of course) and I think the benefits of including it in our diets far outweigh the argument that it may make us put on weight, it is tastier than lard, my children love it and my taste buds relish a smattering of butter on cooked vegetables or mixed into scrambled eggs most days.
Sorry for the unscientific answer, but when it comes down to it, unless you are insulin sensitive and you want to do all you can to stop insulin production in your body - in which case you can probably live happily without butter - I believe it is all a matter of taste; the paleo diet can be hugely restrictive and sometimes a real battle not to give into temptation, so if temptation comes in the form of another kind of healing fat, (which may - because of the effect of Free fatty acids - in the long run curb our cravings for carbs anyway) well, then it isn't the worst thing we could be doing to our bodies.
Great question Dexter, thanks....