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originally "angina pectoris" was rare in the 19th century and before , started increasing in USA ~1920
and in Britain ~1926, although they had some smaller increase in ~1910.
Later in Quebec than Ontario, Australia, Finland , Europe , , now declining in NA,EU,
Remarkable decline in USA 1974-1976.
It's still high in Eastern Europe, where it started later
http://magictour.free.fr/sxh5l1.GIF
The usually given reasons and risk factors do not explain this.
I think this is still unresolved !
"Western Lifestyle" correlates somehow.
Recently (~2015) TMAO , a product of some gut bacteria has been linked to CHD,
but there is no historical data about TMAO or gut bacteria strain prevalence.
It's remarcable that mid-age males are much more affected than mid-age females
so you can just check the male/female 50-60y death ratios, from all causes
which are available for many countries at UNO or HMD or cause-specific deaths
by age from WHO still for a lot of countries sice 1950
and in Britain ~1926, although they had some smaller increase in ~1910.
Later in Quebec than Ontario, Australia, Finland , Europe , , now declining in NA,EU,
Remarkable decline in USA 1974-1976.
It's still high in Eastern Europe, where it started later
http://magictour.free.fr/sxh5l1.GIF
The usually given reasons and risk factors do not explain this.
I think this is still unresolved !
"Western Lifestyle" correlates somehow.
Recently (~2015) TMAO , a product of some gut bacteria has been linked to CHD,
but there is no historical data about TMAO or gut bacteria strain prevalence.
It's remarcable that mid-age males are much more affected than mid-age females
so you can just check the male/female 50-60y death ratios, from all causes
which are available for many countries at UNO or HMD or cause-specific deaths
by age from WHO still for a lot of countries sice 1950