Iguana, maybe you haven't left yet? If not, now do you explain the Swiss peoples in the mountains with their herds of goats and cows as having some of the best health and longest living ages? I don't have first hand experience, just have read accounts. I still believe the success with dairy has much to do with whether the grass and plants the animals are eating is green and nutrient rich, one still has the types of bacteria in their large intestines to digest lactase, and of course heredity plays a part. But then maybe, those swiss weren't drinking the milk,, maybe it was the butter, cream and cheese they were consuming, and the whey went to their farm animals? or they were making fermented products like kefir etc.. I drank my own goats milk for years. Eventually I really only drank kefir and yogurts, and soft cheeses. There was a HUGE difference as to how my body would react to it depending on what time of year (green grass). I also learned to fully sprout any grains they received. I grew it in trays for about a week. They were also let out on sixty acres of pasture and forest, thus ate very little hay, or dried grasses. They also had free and constant access to dried seaweed.