Green tea is probably the most popular drink in Japan. If you are referring to alcohol, beer is probably the most popular drink (since it is much cheaper than sake).
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Some popular traditional food options in Japan include sushi, ramen, tempura, and yakitori. Traditional drink options include green tea, sake, and matcha.
Coffee is Japan's most favorite soft drink
sushi is popular in japan
Baseball is a very popular sport in Japan
One of the reasons Japan is popular is for the sumo wrestling that they perform.
Zen and Nichiren are both popular in Japan.
A lot of silk is produced in Japan, which is why silk worms are so popular there.
Japan
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The best website for popular drink recipes is www.drinknation.com. This website includes a section for top rated drink recipes and most popular drink recipes.
Asahi Super Dry is the most popular beer for younger folks (20 to 30 years old, as 20 is the legal drinking age in Japan) Various happoshu "beer" is also popular with younger folks as it is not real beer but is pretty close so it costs less money. Kirin makes several brews. Kirin Classic is most popular with retired folks. Working guys will drink Kirin Ichiban or Kirin Lager http://wiki.answers.com/Q/What_are_the_most_popular_Japanese_snacks_and_beer_and_are_there_certain_kinds_that_appeal_more_to_the_older_professionals_as_opposed_to_teenagers