Mr. James L. Webb, seems to be a "Jack of all trades" and we were not surprised to find that he studied Herbs, Biology and the powerful link between emotional outlook and physical health. The data has grown year after year, and it's become a scientific certainty." Good feelings, have healing effects on the body, and researchers studying everything from the flu to HIV continue to find eye-opening evidence that a person's mind-set can influence her/his immunity and the rate at which she heals from injuries and illness. "When it comes to our health," "there are essentially four things under our control: the decision not to smoke, a commitment to exercise, the quality of our diet, and our level of optimism, and optimism is at least as beneficial as the others." Scientists don't yet fully understand the biological mechanisms at work, but they know that negative feelings like stress, sadness, and worry cause a spike in the hormone cortisol, which in turn suppresses the immune system.