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>One thing the Dutch do is give doses of vitamins particularly D to all children for the first few years.

just googled, dairy products of course - http://www.bbc.com/news/magazine-34380895

Bigger body is beneficial in colder climate and milk is the key in building the bones to enable it - thus whole North Europe and Eastern Europe consume a lot of milk, and lactose intolerance is rare there while being the norm everywhere else on Earth.

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Countries like India are heavy users of diary products. Lactose intolerance is rare too. But always fare very poorly in the height rankings. So it cannot be concluded that it is diary products alone.

http://timesofindia.indiatimes.com/city/lucknow/Three-out-of...

Many Indians because of poverty dont get access to good food.

milk(calcium) just enables for bigger stronger bones, thus it provides that advantage when there is a pressure for it. The selective pressure for bigger body is present in cold climate and not present in India and even more - due to poverty one can see a pressure for smaller body there. Milk in India is used for another reason - it is a source of cheap (compare to meat) animal protein.

Dietary vitamin D is a relatively low dose and doesn't absorb as well. If you have SAD, for example, the treatment is a humongous needle of VitD and then getting some sun.

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