Good thoughts Robstar,
as is often the case there is usually a number of factors involved in those type of things, and while work may be contributing factor, there also seems to be other personal contributing factors in many cases.
How come some people can seemingly be productive with very few physical problems in similar work circumstances to others who have many problems?
I suggest the old be happy thing can have a lot to do with it....
If you choose to enjoy your life, and it helps if you can do something you enjoy, there should be less difficulty with physical problems.
However there is of course good reason to make your workplace as comfortable as possible from an ergonomic point of view, so if it starts to become uncomfortable to do some regular task, redesign of the task or workplace is usually the best first course of action.
As far as cows milk is concerned, there are some doubts about how good it really is, after all it was originally meant for calves, who are supposed to grow at a rate far in excess of human growth. It may also be possible that the calcium in cows milk isnt that well absorbed in some people, and bone density issues also are affected by regular load bearing physical activity, or lack of. There are some other cultures around the world where cows milk is not consumed at all, and it is not uncommon to hear of people who cant properly digest cows milk, or some component of it.
Despite all this I will concede I still like my lattes and cappas.