blastthru23
Moderator
Interesting. I went ahead and poked around the internet to see what I could find on TTn(total test) and BT(bio-available test) in men up to 100 years ago. To be honest, the scholarly articles discussing the decline in TT and BT in men were rather difficult to follow, however, the gist was an easy grasp. Essentially, the standing hypothesis is that environmental factors, life style, obesity and the decrease in smoking tobacco has played a major role in this finding. Yes, smoking tobacco allegedly increases testosterone! One study showed a 22% drop in testosterone from around 1987 to 1995 , and even further to 2004. In the comment section following, I will post a chart that I snipped from https://academic.oup.com/jcem/article/92/1/196/2598434 (I hope it works)