https://en.wikipedia.org/wiki/Suicide_in_Japan
Japan is not what I would point to as a "healthy" country.
The Japanese attitude towards suicide is different from the Judeo-Christian attitude. Suicide can be honourable in Japanese culture.
As far as healthy goes, the simplest definition is life expectancy at birth. By this measure, Japan is the healthiest country in the world (despite all the suicide). Among developed countries, the United States is the least healthy. The US is unique among wealthy countries in that it lacks a strong State health care system. Thus, the exceptionally poor health of the average US citizen.
https://www.google.com/publicdata/explore?ds=d5bncppjof8f9_&met_y=sp_dyn_le00_in&idim=country:USA&dl=en&hl=en&q=life%20expectancy#!ctype=l&strail=false&bcs=d&nselm=h&met_y=sp_dyn_le00_in&scale_y=lin&ind_y=false&rdim=region&idim=country:USA:JPN:AUS:SGP:HKG:FIN:FRA:DNK:BEL:AUT:DEU:LUX:IRL:SWE:ESP:GBR:NLD:ITA:GRC:KOR:CHE&ifdim=region&hl=en_US&dl=en&ind=false