Why are testosterone levels dropping within the male population?

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Offline nova

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Why have male testosterone levels been dropping since the 1940's?   

On the newbielink:http://www.usdoctor.com [nonactive] website, /testone.htm, it states
 The normal range of testosterone is reported as 350- 1200ng/dl. Studies in the 1940's showed the average testosterone level to be at 700 ng/dl, 300 ng/dl higher than for men today. In the past, a drop in testosterone levels to 250 ng/dl was rarely reported before men were 80 years of age. Yet today, it is not an uncommon value for middle aged men!


Offline tommya300

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It surly seems to follow the trend on who wears the pants in the family.
As heavy duty physical labor gave way to mechanical devices, maybe so did the physical characteristic of the human body did too.
Maybe moral deviation gave way to more readily available avenues of that pressure relief, reducing the load.