Many authorities have identified deficiencies in the education of medical students in health promotion and disease prevention. This report describes an attempt to address this problem through the longitudinal integration of health promotion and disease prevention into several major courses in the student cumculum at Harvard Medical School. We used adult learning theory to develop the cumcular approach, and designed educational experiences to match the professional development of the student at different phases of medical education. Primary, secondary, and tertiary prevention were particularly germane for students in the first, second, and third years, respectively. During clerkships in the third and fourth years, especially those with a focus on ambulatory patients, students built upon earlier experiences to integrate health promotion and disease prevention into clinical practice. By unifying the teaching of disease prevention with several major required courses, we aimed to create an environment in which students could experience their learning about disease prevention in the same manner that we aspired to have them practise it: integrated throughout clinical medicine.