Nurses can use this information to understand why a particular patient may find making recommended health behaviour changes difficult and to determine factors that may help them. 3 Health psychology takes a more holistic view of health and medicine than traditional medicine. Health psychology encompasses a wide range of issues — from chronic pain to terminal illness — with the goals of helping people improve their quality of … Similar efforts need to be made regarding the use of theories as applied to adherence … KEy words These theories make explicit factors that influence behaviour change, such as health beliefs, past behaviour, intention, social influences, perceived control and the context of the behaviour. In behavioral medicine, professionals base their interventions on a few models that attempt to explain people’s health-related behavior: the health belief model, reasoned and planned behavior theory, learning theories/classical conditioning, and social cognitive theory. 2 A working knowledge of some models and theories enables development of practice and research skills. Health Promotion and Disease Prevention Theories and Models There are several theories and models that support the practice of health promotion and disease prevention. Theories and models are used in program planning to understand and explain health behavior and to guide the identification, development, and implementation of interventions. Some researchers have argued that experimental research and increased clarity in theories and methods could assist in the identification of effective behaviour change techniques, thereby contributing to the development of evidence-based practice in health psychology and implementation research [2,3]. The study of health psychology is relevant to nurses working in diabetes care. 4 All theories and models have advantages and disadvantages.