Type O was an early 'success formula' and the type O ancestral prototype was a canny, aggressive predator. Aspects of the Type O profile remain essential in every society even to this day ' leadership, extroversion, energy and focus are among their best traits. Type O's can be powerful and productive, however, when stressed Type O's response can be one of anger, hyperactivity, and impulsivity. When Type O wiring gets crossed, as a result of a poor diet, lack of exercise, unhealthy behaviors or elevated stress levels, Type O's are more vulnerable to negative metabolic effects, including insulin resistance, sluggish thyroid activity,