Why are male testosterone levels falling?
&gt; “Personally I see the decrease of testosterone levels more as a reaction to our changing environment than reason for concern. The world changes and we change with it.“<p>I do not find this analysis and conclusion convincing.  Basically don’t worry about it is the conclusion.  We have rising infertility, both female and male (which people blame on hormone disrupters: <a href="https:&#x2F;&#x2F;www.scientificamerican.com&#x2F;article&#x2F;reproductive-problems-in-both-men-and-women-are-rising-at-an-alarming-rate&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.scientificamerican.com&#x2F;article&#x2F;reproductive-prob...</a> ) and also in developed nations soon to be significant falling populations (already started in China, Japan and South Korea) and just less sex overall ( <a href="https:&#x2F;&#x2F;www.scientificamerican.com&#x2F;article&#x2F;people-have-been-having-less-sex-whether-theyre-teenagers-or-40-somethings&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.scientificamerican.com&#x2F;article&#x2F;people-have-been-...</a> ).  This likely plays into this in some way.  These trends do not lead to a sustainable future - it is like global warming, slow but indicative of bad things coming down the line, but manageable in the immediate.<p>I am quite disappointed in the author to be so dismissive on a topic she is an “instant expert” on.  Only on hacker news does a physicist who spends their days criticizing string theory (and whose expertise there makes sense) make the front page doing an analysis on testosterone.