Introduction : Despite the progress in medical and non-medical interventions for the management of type II diabetes, this condition is still associated with significant mortality and morbidity. In order to hinder or reverse this trend, interventions based on various theories and models are of high signficance. The aim of this study was to determine the effect of an educational intervention based on Pender’s health promotion model on the lifestyle of patients with type II diabetes.

  Methodology : In this clinical trial, patients were randomly allocated to two groups. The intervention group received an educational intervention based on Pender’s model (n=20) and the control group (n=20) received routine training. Data collection tools included a researcher-made questionnaire and Health-Promoting Lifestyle Profile, which were completed before and three months after the intervention by the two groups. Data were analyzed by independent t-test, paired t-test and Chi-squre.

  Results: The mean lifestyle score with regard to nutrition and stress management significantly improved in the intervention group (P=0.016).

  Conclusion: The findings indicated positive lifestyle changes, which confirmed the effectiveness of Pender’s model for improving health behaviors of patients with type II diabetes .