Stress experienced by pigs during transport, handling and slaughter, significantly elevates their levels of adrenaline, cortisol and steroids. Regular consumption of meat laden with these hormones can create an increase in female sex hormone (estrogen) and a decrease in male sex hormone (testosterone). The growth of breast tissue in men (gynecomastia), is almost always caused by an imbalance of estrogenic and androgenic effects.

Animal Stress and Human Hormones