On-line health education includes displaying composites of personalized health content and patient-selected entertainment. Suitable sources of entertainment include generally available web pages and television programs. Composites are spatial (for page displays) or temporal (for image sequence displays). Health content is customized to health and personal situations of individual patients, and replaces advertisements. Composites are generated on a central server in communication with an entertainment server and a health server. Amenable diseases or behaviors include diabetes, asthma, hypertension, cardiovascular disease, eating disorders, HIV, mental health disorders, smoking, and alcohol and drug abuse.