Food for more testosterone
Nutrients work hand in hand with hormones like testosterone to build muscle. But if you've been following the traditional, outdated advice for losing weight—cut calories, reduce dietary fat, and watch your intake of red meat and eggs—you are missing out on those critical nutrients that build T levels and foster "anabolism," or muscle growth. If you want to lose 20 pounds of fat, build major muscle, and boost your testosterone, pair your workouts with these food rules from sports nutritionist Tara Gidus, ., team dietitian for the NBA's Orlando Magic.
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.