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 It's likely a correlation between:
Amount of processed foods eaten
Amount of pesticides on and in foods
Amount of environmental synthetic birth control hormones
Emphasis on high carb, low protein, low healthy fats consumed
Amount of seed oils consumed
Lack of running around outside growing up
Houses being too well sealed/never experiencing hot and cold extremes
Poor sleeping habits
Being fat (effects aside from poor eating habits and bad foods, it's really bad for people) 
Lack of fitness
Too much medication
Lack of healthy gut biome
Not eating traditional fermented foods
Too much alcohol
Too much cannabis
Too little motivation toward actual physical sexual relationships (probably from much too young exposure to porn and all the beauty influencers) 
Too much social media leading to dopamine addiction
Et cetera.  
 Yes 👍 I would agree it’s got to be a combination 
 No, it isn't. And not meant, or not enough, people realize any of this.  
 Those were my immediate assumptions too, more or less.

I would have also been prepared for more obscure psychosocial explanations - status of men/masculinity, size of social groups, locus of control.

But no - look, Kazakhstan and Uzbekistan are at opposite extremes.

WTF...? 
 Yeah those two (Uzbekistan and Kazakhstan) are what’s throwing me off… 😵‍💫 
 Belarus vs Russia/Ukraine, too. 
 Well Russia they eat more lamb, goat, beef, and some horse as well. In Ukraine it’s more pork and I think chicken? Maybe that has some difference? 
 But I know this famous chocolate from Kazakhstan has a flavor enhancer (I know because I’m allergic to it) so maybe they add that in other foods? Maybe  Uzbekistan does not use that? 
 China LOVES its flavour enhancer 621, but they're upper-middle for T. 
 Oh that’s true… 😵‍💫 
 @StellaInForest is gonna love this, look at the map:

https://testosteronedecline.com/wp-content/uploads/2023/10/Testosterone-Levels-Worldwide-full-size.png

It correlates with war.

Look at the Balkans. 
 What the hell is going over in Portland, Oregon? 
 Ohhh… that’s a good observation, but in today’s time the US has created most of the wars going on at the moment. 🤷‍♀️