Research has shown that a reduction in testosterone production in men can affect their mood and low testosterone can be a cause of real mental depression in some men. Low testosterone and depression share many of the same symptoms. Both low testosterone and depression can cause decreased sex drive, sadness, difficulty concentrating, fatigue, lack of energy, and loss of interest in normal activities.
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Dr. Gudmundur Björnsson is an icelandic physician, a specialist in medical rehabilitation, a certified independent medical examineer (CIME) and an MBA. He now runs his own company as a medical advisor mostly in insurance medicine. He has previously been a head of a rehabilitation clinic and president IMA. 




