The health fair is an approach used to educate the public with regard to health promotion and illness prevention. The professional literature describes the organization of a health fair and the need to evaluate its effects. Relatively little has been written that deals specifically with the effects of a health fair in terms of impact on knowledge and client behavior. The health-belief model provides a framework for investigating the effectiveness of such a fair as a vehicle for changing health behaviors by providing information and serving as a cue to action.

An evaluation of a women's health day program on a large military base indicated that health fairs are effective in terms of dissemination of information and intent to change behavior. A questionnaire examined the extent of health knowledge and behaviors practiced by participants. A significant difference between pretest and posttest scores for knowledge was noted. A majority of respondents also indicated their intent to change from health-damaging to health-promoting behaviors.