Background & aim: Health and behavior are related to each other and many diseases are originated from individuals' unhealthy behavior and habits. Therefore prediction or determination of the behavior is useful to explore effective measures to promote health and reduce risk of the diseases. This study was aimed to determine the effective factors on healthy nutritional behavior of health volunteers based on precede proceed model.

Methods: This research was a descriptive, analytical and cross-sectional study. Research population was all the 153 active health volunteers in Rasht urban health centers and health posts in 2015. Data collection tool was a self-report, reliable and valid questionnaire. Data were analyzed with descriptive and analytical statistics using SPSS18.

Results: The mean age of the health volunteers was 43.03±9.11. All Precede Proceed model structures including: knowledge (β=0.296, p<0.0001), attitude (β=0.396, p<0.0001), reinforcing factors (β=0.155, p<0.02) and enabling factors (β=0.144, p<0.03) were predictive for nutritional behavior. Linear regression test showed that Precede Proceed Model structures altogether accounts for 40 percent of healthy dietary behavior changes (R²=0.400, p<0.0001). There were significant positive correlations between precede model constructs and nutritional behavior (p<0.05).

Conclusion: Attitude, knowledge, reinforcing, and enabling factors were respectively the most effective factors on nutritional behavior. Attitude and enabling factors status were desirable and other constructs were in moderate level. Considering positive correlations between Precede model constructs and nutritional behavior of health volunteers; appropriate educational intervention based on Precede Proceed Model is recommended to promote nutritional behaviors.