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Testosterone is down by about half since 1970. (Unclear if related, but I think a bunch of these plastics are endocrine disruptors.)

Testosterone has not fallen. That idea is mainly a result of bad sampling and incomparable measurements. See: https://xcancel.com/cremieuxrecueil/status/19804871302092350...

Thanks, I'll have to take another look at it. Last I checked, the ~2000-2020 situation was unfortunately consistent with the previous trend.

Fallen or not, it may apparently be doubled, with great benefits to mental and physical health.

No affiliation, just thought this was extremely interesting. This seems to boil down entirely to nutrition, from what I gathered.