Thousands of years ago, we mostly lived until we either starved, were accidentally poisoned or we were eaten by another animal. Now, we have the distinct ability to slowly kill ourselves over a period of about 80 years with chemical laced foods, too much alcohol and prolonged reaction to stressful events. All are avoidable, if we make the choice to do so. Prolonged, sustained, excessive stress and your similar response to it, not only causes deterioration of your brain, but it also compromises your immune system; your ability to fight off diseases.