Background & Objective: Diabetes is one of diseases in which the main part of treatment depends on the patient's responsibility. Therefore their knowledge of the various aspects of nutrition has great importance. The aim of this study was to evaluate the effect of diabetic diet education on nutritional behaviors. FBS and BMI of patients with type II Diabetes mellitus in Iranian Diabetic Association.

  Methods: 88 type II diabetic patients from Iranian Diabets Association (Karaj Branch) participated in this study. The Patients were randomly divided into two groups as experimental (44) and control group (44). Data were collected with a valid and reliable questionnaire (58questions) and checklist in two stage of before and one month after intervention.

  Results: After the intervention in the experimental group regarding diabetes and nutritional behaviors, there was a significant increase in mean score of knowledge (from 57.50 to 80.18) and a significant decrease in the mean of BMI (from 28.3 to 27.9) and in the mean of fasting blood sugar (from 167.9 to 134.5) (p<0.001). However, there was no significant change in the control group.

  Conclusion: The finding of this study indicated the efficacy of education on FBS and BMI in patients with type II diabetes.