If asians have high lactose intolerance than how do the mongols and some asiatic tribes in central and northern asia consume dairy so much?

dairy Is practically a traditional food for mongols considering how they live in near tundra climates where fruits, veggies, and grains are not plentiful.

am could be said for some tribes in Siberia, and central asians like Kazakhs, Tajiks,
Update: and why is milk still sold in asian countries?? while is yogurt and ice cream enjoyed by the local populations in those countries?
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