Our text reading this week introduces the discipline of health psychology and reviews body systems. This subject content provides a foundation for exploring various topics in health and illness, and how to evaluate health-related behaviors and health promotion practices across the lifespan. The biopsychosocial model of health psychology is described. An historical overview of its development from preceding theoretical models in psychology is provided. We can evaluate individual healthcare choices and utilization of healthcare services using this model. Utilizing the biopsychosocial model, research a selected psychological diagnosis and evaluate health-related behaviors and health promotion practices related to this condition from the standpoint of associated biological, psychological, and social factors.