“The human organism is able to heal 60 to 70 percent of all ailments on its own,” says Professor Gustav Dobos, senior consultant at the Miners’ Hospital in Essen, Germany. To that end, the body is said to produce some 30 to 40 medicines, such as cortisone and substances to prevent kidney stones. Researchers understand some processes involved in such natural healing, but much remains to be discovered. Scientists discern that “a complicated interaction of hormones, immune messengers, and killer cells is at work,” says the magazine Vital, and “emotions and moods also play a role.” However, it further states that stress and personal problems can “weaken the immune system for months on end.”