Maidup // ...milk is meant for calves, human can tolerate a certain amount of it, but too much milk, even if it were pasturised, and you'll develop an intolerance. //
The tolerance of milk is a matter of genetics. The genes involved started to become common about 8,000 years ago. However people in many parts of the world remain intolerant of milk, particularly as adults.
I spent some time in China many years ago and it was very hard to find milk in the shops at all. Even in McDonald the only "milk" was 50 percent soy. It was also hard to find chocolate and icecream.
The case is also similar with alcohol. Oriental people in general have a low tolerance to alcohol. We searched for a long time to find a bottle of champaigne. The one we found, along with every glass of wine we had was aweful.
They do make a reasonable beer though. They came to Australia to learn how to make that.
Another relatively recent genetic development is the ability to tolerate gluten in the diet. This came about around 10,000 years ago with the rise of agricultural production of wheat and rye. Gluten intolerance is one one of the most underdiagnosed syndromes in the world.
However some people make the mistake of assuming that both milk and gluten are somehow inherently bad because some people cannot tolerate them. Advertising wheat-free and dairy-free is often presented as a great benefit for all rather than just those whose bodies cannot deal with them.
Ironically they instead laud the inclusion of soy which is also not tolerated by some people. However I recently saw a product claiming "soy-free". Perhaps it is the start of a new trend as people begin to realise that the claims about the health benefits of soy are completely unsubstantiated and it isn't all that good for humans.