Well, if you are into low carb diet, don't go to Japan. There are so many good food at good price, you would be crazy to pass them up and eat low carb in Japan. Good thing about Japan is you walk a lot. That will compensate so of the curb you take in.
One of the best things happen in Japan was the development of 100 Yen shop. It is amazing to see things you can buy for 100 Yen. What is the favorite thing you bought at 100 Yen shop?
When you travel overseas, you sometime forget how much you are spending. Some of the places design to serve tourists are often over priced. Try to eat where local people eat. I visited Kuromon Market on Osaka/Namba ... I did not see any Japanese people except people selling items.
Those pictures show what I brought back from Japan as gifts for my company. They were heavy but very popular. Just make sure you don't bring back anything that contains meat or fruits.
Okonomiyaki ... a Japanese savory pancake containing a variety of ingredients. The name is derived from the word okonomi, meaning "how you like" or "what you like", and yaki meaning "grill". Okonomiyaki is mainly associated with the Kansai or Hiroshima areas of Japan, but is widely available throughout the country. You got tottery it. https://en.wikipedia.org/wiki/Okonomiyaki
Have you ever wonder what is the standard power outlets in Jaoan? Here they are.
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China Town in Kobe is called Nanking Town 南京町 You can eat Ramen for 300 yen on the street. I had Ramen Set fot 950yen including tax. People who work there pronounce Japanese language like people from China do. But i am sure most of them can speak Japanese fluently. They must be acting....
What is Manzai? Japanese comic usually performed by two people. Yoshimoto is the company that is the major player in Japan. Their main stage is call Namba Grand Kagets. A lot of people there.
Japan used to have a national retail stystem called JNR, Japan National Rail. They were privatized and it is called JR, Japan Rail. They cover most areas of Japan but there are a few private rail companies. Hankyu is one of them.