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.     
As he states, regardless, a quadrupling of the antibody presence is alarming considering the progression of other autoimmune diseases in recent years. Are we really just better at diagnosing diabetes, autism, asthma, alzheimers, etc? Of course we are better, but it’s somewhat driven by the increasing prevalence. Physical signs of the disease truly increasing such as this study provides are invaluable because it drives the obvious question of “why?” And the sooner we find that, the sooner we can prevent. Get on it, researchers!
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