This research aims to evaluate and present the effectiveness of cognitive behaviour therapy in the treatment of Bulimia Nervosa. Illnesses have been around since the world started. They plagued the lives of all organisms throughout history. Plants, animals and humans can acquire different illnesses at certain points of their lives in one way or another. As knowledge takes on its advancement, the solutions or cure to these illnesses diseases have been developed and are constantly being studied to create better cures. With the availability of those cures, the lives of organisms are prolonged allowing them to survive longer. Even though cures are being developed and improved, the existence of different illnesses is continuously considered as one of the main concerns in medical profession. Some older drugs and therapies may not be effective for illnesses today which mean consistent research must be done to ensure the survival of humans and other organisms. In that case, illnesses capture the attention of scientists and medical practitioners alike as those illnesses are big threats to the lives of many. Also there are diseases that are not yet curable as there are no stable solutions for those problems yet. In response to that topic, it would help to focus on the very meaning of disease and how it affects the lives of all living beings. The very existence being searched for by scientists is the disease which is defined together with health.
The World Health Organization defined health in 1948 as “a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity,” (Bonita, Beaglehole, and Kjellstrom, 2006, p. 15). That definition of health is very much ideal as it would be difficult to measure the well-being or to create the exact criteria. Making standards for the well-being was close to impossible with that statement or definition that made it bombarded with criticisms. Others may say that health is the absence of disease, so in order to define disease and clearly separate it from health, the following can specifically