The Health Education component of a coordinated school health program is a planned, sequential, K-12 curriculum that addresses the physical, mental, emotional and social dimensions of health. The curriculum is designed to motivate and assist students in maintaining and improving their health, preventing disease, and reducing health-related risk behaviors. It allows students to develop and demonstrate increasingly sophisticated health-related knowledge, attitudes, skill, and practices. The curriculum is comprehensive and includes a variety of topics such as: personal health, family health, community health, consumer health, environmental health, family life, mental and emotional health, injury prevention and safety, nutrition, prevention and control of disease, and substance use and abuse.  Some school programs focus the health education curriculum on the priority health risk factors of the nation and the state:  i.e., behaviors that result in unintentional and intentional injuries; tobacco, alcohol, and other drug use; sexual behaviors that result in HIV infection, other sexually transmitted diseases, and unintended pregnancies; poor dietary behaviors; and physical inactivity.  Qualified teachers who are trained to teach the subject should teach health education.