To keep normal testosterone levels in your body, you have to avoid the five enemies of this androgenic hormone. Enemy number one is alcohol; too much alcohol inhibits the gonadotroph cells in the pituitary gland from producing luteinizing hormone, which induces the Leydig cells in the testes to produce testosterone. Even small amounts of alcohol consumed with popular drinks, such as beer, activates aromatase, which is an enzyme found in body tissues; and this enzyme is enemy number two, which converts testosterone into estradiol, a type of estrogen (a feminine hormone). No matter how expensive and good the red wine might be, as long as it has alcohol it is bad for you. Remember this, the Neanderthal, and the Cro-magnon to a less degree, had the strength and speed to dispatch a buffalo with one deadly thrust of his spear, and the only stuff these men ate and drank was meat, nuts, and water! Even a gold medal-winning athlete of today is no match for a Neanderthal. Take a look at his thick femur and humerus bones in a museum.
Enemy number three is epinephrine (adrenalin). When we are subjected to stress, the adrenalin glands produce great amount of epinephrine, which substantially reduces the testosterone levels in the bloodstream. So, relax and take it easy, don't worry. Enemy number four is zinc deficiency, for when zinc levels in you body drops below normal, enemy number two (aromatase)'s activity accelerates; so try to regularly eat red meat, oysters, and nuts, which are among the richest sources of zinc. Finally, enemy number five is sedentariness; testosterone production rises only when you work out, especially if you do push-up, pull-ups and lift weights, for muscle contraction estimulates the secretion of testosterone.
So, to have acceptable levels of testosterone in your bloodstream remember the five enemies: 1- alcohol, 2- aromatase, 3- adrenaline, 4- zinc deficiency, 5- a sedentary lifestyle.