I saw a scientific tv program about this once. The reason behind it, they said, is that in the old days when water wasnt very pure, the "west" purified their water by brewing it and the "east" boiled it and made tea or whatever. Its understandable that it doesnt apply to all asians but an on-average difference is clear. I guess you can imagine the people in the west who couldnt take their ale drinking dirty water (probably every day) and dying so it made the ones who produced a lot of that enzyme which breaks down alcohol to be the ones who were more likely to reproduce.
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There are only two industries that refer to their customers as "users". - Edward Tufte
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