The document provides an overview of several foundational health education theories: - Locus of control theory examines individuals' beliefs about whether their health is controlled internally through their own actions or externally by outside factors. - The transtheoretical model of change outlines 5 stages of readiness to change a health behavior. - The health belief model proposes that health-related behaviors depend on perceptions of susceptibility, severity, benefits and barriers. - Social learning theory and the theory of reasoned action both focus on how environmental and social influences impact intentions and capabilities regarding health behaviors. - Diffusion theory examines how new health ideas or practices are adopted through key influencers and factors like relative advantage, compatibility and observability.