I'm not a physician, and as always, you should check with your physician for medical advice and treatment, however, Mayo Clinic.com as well as a few other online medical sites have some interesting facts on this subject. Mayo clinic says that declining testosterone levels "can cause Decreased sexual function, Loss of bone density, Loss of muscle mass, Increase in fat mass, Reduced muscle strength, Memory loss, Mood changes and depression"

Source(s):
http://www.mayoclinic.com/health/testosterone-therapy/MC00030
http://www.andrebergermd.com/male-menopause.html
http://www.medicalnewstoday.com/articles/81764.php

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I am an endocrinologist. Testosterone deficiency in men causes fatigue, increase in fat/muscle mass ratio (often seen as weight gain), loss of libido, erectile dysfunction, and low mood. It can also caused low bone density and contribute to issues such as heart disease.
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