Blood type 0 is the primal blood type of our ancestors who were cunning, aggressive predators. People with this blood type play important roles in any society, even to this day. The leadership, proactivity, energy and ability to stay focused are among the best qualities of people with blood type O. They can be powerful and productive. However, when they are under stress they may become angry, hyperactive and impulsive. Poor diet, lack of exercise, unhealthy habits or elevated stress levels, are making them more sensitive to adverse metabolic effects, including insulin resistance, low activity of the thyroid gland and obesity. Your genetic inheritance offers you the opportunity to be a strong, productive, to have a long life and to be optimistic.