The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression".   Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible.  The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game.  Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males.     
Does andro sound familiar, sports fans? If so, it’s likely because baseball superstar Mark “Big Mac” McGwire used the prohormone during his impressive major league run. At the time, it was legal and sold over the counter, but eventually its status shifted. In 1999, McGwire denounced andro and publicly stated that he’d stopped taking it. Eleven years later, he expressed regret about that point in his career, and admitted that other steroid use coincided with his andro days. Although prohormones aren’t quite anabolic steroids, the intended effects – and the stigma – are very similar. Side Effects of Prohormones Like anabolic steroids, prohormones, due to the biological changes that they potentially instigate, may have pronounced side effects. These adverse outcomes have been pinpointed in a number of studies, which indicate that the unfortunate effects of prohormones may involve:
When it comes to metabolism, energy, immunity, memory, mood and strength, who doesn’t need a boost now and then? The Hormone Boost/The Hormone Fix represents a breakthrough by offering, for the first time, a weight loss and wellness solution that focuses on a combination of six specific hormones.
Although it is widely accepted that the thyroid hormones influence energy levels and weight loss efforts, The Hormone Boost reveals how the impact of five other hormones–testosterone and DHEAs, adiponectin, growth hormone, adrenalin, and glucagon–are equally important when trying to lose weight and optimize health.
Unlike the methods shared in Dr. Turner ND’s previous books, which focused on identifying and solving hormonal imbalances, this groundbreaking and proven plan suits everyone–not just those experiencing symptoms of hormone disruption–by optimizing what’s right rather than correcting what’s wrong.
With over 60 recipes and a simple Pick-4 guide that allows you to create hormone-optimizing meals, smoothies and salads, Dr. Turner ND’s program ensures the right balance of carbs, fat and protein at each meal. The Hormone Boost/The Hormone Fix also features: simple steps to prep your home and body for a hormone boost, daily tracking aids, a weekly workout plan emphasizing strength training, supplement advice, and inspiring success stories from people who have experienced the benefits of this unique program.