It seems like you can't listen to any radio station without hearing commercials for some drug that helps men with low testosterone . They tell you all the side effects of low testosterone like, lack of energy, mood problems including depression, increase of body fat, loss of muscle mass and strength, decreased libido or sex drive and erectile dysfunction. But none of them seem to ask, why do all these men have low testosterone now? What has changed that has made males testosterone levels decrease? The answer lies in many areas including, diet, exercise and environment. To try and figure out how or why so many males testosterone levels are dropping, you must first look at how the body produces testosterone. In humans and most other animals, testosterone is produced primarily by the testicles in males, and to a lesser extent, the ovaries in females. Like other steroid hormones, testosterone is derived from cholesterol. The first step in the biosynthesis invo...