Even if one could determine how much if at all the IGF-1 rise is in an individual's body after eating a cup of yoghurt or any other dairy -- what would that prove? I think there is great variability in susceptibility/vulnerability to IGF-1 just as there is variability in susceptibiilty/vulnerability to hormones in general. In other words, even if you could determine with precision how much IGF-1 increased in a particular person after eating dairy, the increase could be beneficial (muscle growth) or detrimental (tumor growth) or just a wash (no apparant effect other than a lab value) depending upon the context.

Dairy, whether butter, cream, cheese or yoghurt isn't paleo -- but if you tolerate dairy and like yoghurt, buy the highest quality full-fat variety you can find and enjoy. So many cultures (pun intended) thrive on yoghurt, so I wouldn't worry about a transient IGF-1 rise. Just buy unsweetened, full-fat, organic -- grass-fed if possible and enjoy. Unpasteurized can be difficult to source and not worth raising your cortisol over worrying about it. Great if you can find it but if not, I wouldn't lose sleep over it.

all dairy is not created the same.......most of the dairy in this country is processed and still spikes IGF-1 abnormally. If youre going to eat dairy try to make it raw if possible from pastured animals.

Who really KNOWS about IGF. Thats what I'd like to know. Where can I find out for instance: What becomes of it in the milk if it is cultured and combined say with flax oil as per Budwig cancer treatment and yet milk is IGF raising. I have not heard an answer yet and it would seem the most relevant point. It needs to relate to cancer in general, not just breast which is often mentioned in the context of IGF. If it does encourage an existing tumour to grow even a cell more then it rules out a whole range of dietary options. Lets assume best quality, whole milk untreated and cultured naturally as a starting point.