ANSWERS: 2
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I don't know but I have an opinion. It's a thick, rich, festive beverage that seems right for holiday feasting. People also drink it for Thanksgiving. It's nice drink for cold weather, but not suitable to drink in large quantities, so people tend to move on to other beverages for New Years.
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It might stem from many of the Christian abstinence practices of ages past. Like Lent ( the 40 or so days before Easter), Advent (the 4 weeks before Christmas) is also a season of abstaining from many of the 'earthly' pleasures like rich foods. So in centuries past, there would have been a surplus of agricultural produce of eggs, cream, butter, etc. that could be consumed once Advent was over, that is, during the Christmas season, which , believe it or not, used to begin on Christmas day, not on the American Thanksgiving weekend. Egg nog contains things like eggs, cream and alcohol (previously in the form of beer or beer-like drinks) which would have been forbidden for the 4 weeks before Christmas Day. Plus the fact that Christmas in most European and North American countries tend to be celebrated during the winter (cold) season, thick warming drinks would have been enjoyed more than long tall cool ones, like iced tea or beer.
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