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Testosterone Tumbling in American Males
An anonymous reader writes "Yahoo is running a story about a study that concludes that testosterone levels are falling across all age groups among American men. It says 'The testosterone-fueled American male may be losing his punch'" I leave it to you all to draw your conclusions about this, but I still wonder what my hours of laptop-fu does to me.
Having being diagnosed, and having surgery and chemotherapy for this (like Lance Armstrong et al), there is a worrying trend. There is no known cause of this cancer scientifically proved, but after getting this cancer, and speaking 'hear say' to consultants, doctors. etc. one theory is that estrogen (oestrogen), the female hormone, is being dumped into the environment from products (baby products, nappies etc.). This chemical doesn't break down in nature - so drinking water, cows milk, fish, meat... all contain this bumped chemical up that would not otherwise be there. Too see how bad it is, there are even scientific reports of fish changing sex in estrogen rich rivers - do a google on this. This is not a subject to laugh at.
Quite probably, yes. Adipose cells make an enzyme called aromatase, which converts testosterone into estrogen for the fat cell's use. (estrogen actually makes fat more metabolically active, so it's not really a bad thing per se) This, however, has the effect of lowering free testosterone in the body as a whole. If you lose fat, your testosterone levels WILL increase.
However, keep in mind humans are the only animal species that actually get overall, most of their testosterone from DHEA rather than free testosterone in the blood. In addition to stimulating androgen receptors directly, DHEA is also metabolized by local tissues into testosterone (and estrogen) as needed. So free testosterone is one part of the picture. Androgen receptor sensitivity and density also matter, but I'm uncertain as to what factors dynamically affect those in adults.