Health and the brain are closely related. The person, who cannot exercise control over the brain, cannot remain healthy physically, mentally and emotionally. Even if he has no control over the diseases caused by external factors, major illnesses have a lot to do with self-restraint and the lack of it. The brain has been the subject of deep study in physiology, in the course of which alpha and theta waves have been studied. The alpha waves reduce the tension in the brain, which means the balanced secretion from the glands. Man remains healthy when the intimae secretion of the glands starts becoming balanced.