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Source: Wikipedia

Most steroid hormones are derived from the cholesterol molecule. 99% of testosterone is produced in the testes with the other 5% being produced in the adrenal glands..  The biosynthesis of testosterone in the testes involves the removal of 6 carbon atoms from a cholesterol molecule forming the hormone precursor Pregnenolone.  Pregnenolone is the precursor for most steroid hormones including androgens (the hormones responsible for development of male sex organs and secondary sex characteristics) the most major of which is testosterone, estrogens, and others.  To read more about the biosynthesis of testosterone, here’s a cool picture from wikipedia:  (kudos to you if you understand any of this)

What is testosterone deficiency?

The amount of testosterone in adult males range from 270 ng/dL to 1070 ng/dL with the average level being 679 ng/dL.  The average male's testosterone levels peak around the age of 20 after which the amount of testosterone men produce gradually decreases.  This can lead to a whole host of health problems in men including, but not limited, to loss of libido, loss of muscle mass, and loss of energy and motivation in general.

Low testosterone is not just a problem for the elderly, and over the past 20 years a noticeable decrease in the amount of testosterone in males has been observed. This rapid decline of average testosterone amounts is believed to be caused by a dramatic shift in lifestyle and diet.  According to the department of Health & Human Services,
only one in 3 children are physically active every day and less than 5% of adults get more than 30 minutes of physical activity a day.

The negative effects from this lack of physical activity are then exacerbated by the
piss poor diets  of the american populous.  A direct quote from the researchers at the National Cancer institute reads “nearly the entire U.S. population consumes a diet that is not on par with recommendations. These findings add another piece to the rather disturbing picture that is emerging of a nation’s diet in crisis.”  The study found that 96.5% of American's were not meeting the recommended amounts of fruit and vegetables and 99% were not meeting the recommended amounts of whole grains. Given the ever increasing amount of fast food restaurants that can be found on just about every block this is anything but surprising and the recent drop in average male testosterone levels seems to fit right into this growing trend of fitness-absent lifestyles revolving around videogames and take-out.

For Facts and Symptoms of Low Testosterone, Click Here

A molecule of testosterone

A bodybuilder injecting synthetic testosterone

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What is Testosterone?

Testosterone is the primary sex hormone in men. In humans, specifically males, it is one of the primary hormones in the production of reproductive tissues, as well as in the production of muscle and bone mass.  It is also a key component in preventing the occurrence of osteoporosis, a disease that causes bones to lose strength and become more prone to fractures and breaks.  

How and where is it produced?

All About Testosterone