That is something that I also, as an American of mostly English/French/German descent, have wondered about. It was, quite frankly, a revelation to me when I first encountered people who were lactose intolerant in college.
It seems even more unlikely, given that China has had so much interaction with the nomad peoples from Mongolia, Manchuria, and central Asia, who lived mostly off of their herds and milk-products.
It seems even more unlikely, given that China has had so much interaction with the nomad peoples from Mongolia, Manchuria, and central Asia, who lived mostly off of their herds and milk-products.