Type "O" Blood

Type "O" blood is sometimes called "Cave Man Blood" because it is the original type of blood and goes back to prehistoric days. For example, if you want to be a vegetarian Type "A" blood is the best if you want to do that and type "O" is the worst because of its primal nature. Type "O" blood people need to be very physically active and usually need to eat meat in order to stay healthy. This is what nutritionists say.