Objective: A study of relationship between self-reported knowledge on health and lifestyle.
Methods and Results: This is a cross-sectional study and the study population is all Iranian aged between 18-65. In this study 27883 cases have been sampled by the multistage sampling method.
A questionnaire was used for data gathering that was made and standardized by researchers.
The bivariate correlation between self-reported general knowledge on health and three variables for assessing life style consist of nutrition status, Smoking and exercise was meaningful for all variables. The relationship between knowledge and smoking way negative and the other were positive.
Conclusion: trying to promote people's knowledge may increase their health related behavior and life style. In this way strengthening health communication in the Medias and updating existing information can improve people's knowledge. By the way trying to improve health literacy in the community may affect use of existing information and improve people's knowledge on health.

Keywords: Self-reported knowledge, Life style, Iran

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