Any medical or physiological textbook, which discusses breath control in the human body, states that respiration, in healthy people, is mainly controlled by CO2 concentrations in the brain and arterial blood.

Chronic overbreathing causes a variety of symptoms due to dozens of physiological abnormalities created by alveolar hypocapnia (low CO2 in the alveoli of the lungs) in each system of the human body.

Medical science has revealed an alarming fact 80 % of the population is breathing wrong - shallow & inefficient, chest only.