More people are dying per 100,000 of population in northern Japan than elsewhere in the nation, and it could well be down to too much salt in the diet.
The 2015 mortality rate was highest for both men and women in Aomori Prefecture at the northern tip of the Japan’s main island of Honshu. For men, Aomori was followed by two other prefectures in the northern Tohoku region － Akita and Iwate.
Nagano Prefecture, a snowy region in the central part of the main island, ranked lowest for both sexes in the survey results announced by the health ministry June 14.
The ministry official who released the results speculated that it was the "consequence of the dietary culture of cold regions that traditionally uses a lot of salt for preserved （vegetables）," while in chilly Nagano a "（public health campaign） to improve dietary style has seemingly paid off."
The national average death rate for men decreased by 58.3 points compared to the last survey, and was at 486.0 persons per 100,000. For women, it decreased by 20.0 points, and was recorded at 255.0.
Source article: http://iservice.ltn.com.tw/Service/english/english.php?engno=1124234&day=2017-08-04