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.
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Thanks for the reference. I read one great book about the effects of social factors/stress on endocrine function, including testosterone: "Why Zebra's Don't Get Ulcers". It discusses biological mechanisms linking stress and endocrine function. It had lots of good references.
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Dogs are an interesting sentinel species. There appears to be increasingly lower sperm counts, female/male birth bias, and cryptochordism in domesticated dogs https://www.nature.com/articles/s41598-019-39913-9 … https://www.nature.com/articles/srep31281 …
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