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Are testosterone levels in men really falling? If so, what might be the causes? And is it something to worry about. We have looked at what the literature says and summarize it for you.
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Data for the rise in testosterone supplement sales are here
https://www.mja.com.au/system/files/issues/199_08_211013/han10111_fm.pdf
FDA advice on the use of testosterone supplements is here:
https://www.fda.gov/drugs/drug-safety-and-availability/fda-drug-safety-communication-fda-cautions-about-using-testosterone-products-low-testosterone-due
The paper about how testosterone levels change during the day is this:
https://academic.oup.com/jcem/article-abstract/56/6/1278/2675408
The paper about lower testosterone level in married men is here:
https://www.sciencedirect.com/science/article/abs/pii/S1090513801001015
The paper about testosterone levels falling when holding an infant is this:
https://www.sciencedirect.com/science/article/abs/pii/S1090513899000422
The meta-analysis about male testosterone levels is here:
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0109346
The 2007 paper about the decline of testosterone levels in Boston is here:
https://academic.oup.com/jcem/article/92/1/196/2598434
The 2013 study about the decline of testosterone levels in Finnish men is this:
https://eje.bioscientifica.com/view/journals/eje/168/2/227.xml
The 2016 paper about the decline of grip strength is here:
https://www.jhandtherapy.org/article/S0894-1130(15)00212-4/fulltext
The 2013 paper about children running slower is this:
https://www.ahajournals.org/doi/abs/10.1161/circ.128.suppl_22.a13498
The paper about the impact of a high-protein diet on testosterone is here:
https://journals.sagepub.com/doi/10.1177/02601060221083079
The paper about the two-way causation between obesity and decline in testosterone levels is here:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3955331/pdf/AJA-16-223.pdf
The 2015 meta-analysis about the link between testosterone levels in men and smoking is here:
https://linkinghub.elsevier.com/retrieve/pii/S0091743515003941
00:00 Intro
00:28 The Worry
02:43 How Much Testosterone Is Normal?
06:03 Are Testosterone Levels Really Falling?
09:06 Possible Causes
11:45 Should We Worry About It?
12:53 Protect Yourself from Cyber Threats
Many thanks to Jordi Busqué for helping with this video http://jordibusque.com/
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