How can our thoughts affect our health so profoundly? This article explains it very well! In a nutshell, "Our emotions and experiences are essentially energy and they can be stored in the cellular memory of our bodies." This article from Psychology Today offers a more scientific explanation..."First, sympathetic fibers descend from the brain into both primary (bone marrow and thymus) and secondary (spleen and lymph nodes) lymphoid tissues (Felten & Felten, 1994). These fibers can release a wide variety of substances that influence immune responses by binding to receptors on white blood cells....there is direct evidence that stress-related immunosuppression can increase vulnerability to disease in animals".