Average testosterone levels have been dropping by 1 percent a year since the 1980's https://uk.reuters.com/article/health-testosterone-levels-dc-idUKKIM16976320061101ā¦
I've seen this mentioned but also encountered surprisingly little discussion - have you found well-researched accessible writeups? I'd love a link if so!
I'm deeply confused by the worldwide drop in testosterone levels & sperm counts. It's a *huge* effect, too big to be explained by obesity. The most common explanation I see proposed is environmental contaminants. But I don't know if that's true, or which contaminants matter most.