The (really really really BIIIIG!!!) difference is:

Leftists that are not tankies do NOT vote for tankies, whilst busily gaslighting everyone (“They are not a Tankie, because that words meaningless!”). Whereas Liberals, Centrists and Republicans DO vote for conservative parties harbouring some Nazis!

Q: What do you call a big tent conservative party with a couple Nazis in it?

A: the Nazi Party!

It’s also very difficult statistically to remove the co-morbidity factors:

populations that eat more “processed” foods !especially in the US! are poor, in toxic environs, stressed, over-policed, incarcerated, discriminated, unstable housing healthcare employment, using “coping” mechanisms, in a food desert, multigenerational defecit of various “health skills”, no “free” time for cooking and exercise, etc etc etc

If they had healthcare, housing and union jobs … stats wouldn’t be near so bad for them