Gestational diabetes mellitus prevention efforts related to weight control and healthy lifestyle can potentially decrease risks of adverse outcomes for mothers and their children. For up to 85% of women who already have a diagnosis of GDM. Women with GDM who received dietary intervention, physical activity , self-monitoring of blood glucose (BG), and insulin therapy had significantly lower risks of macrosomia, shoulder dystocia 5.9%, cesarean delivery 26.9% , and preeclampsia or gestational hypertension 8.6% than those who received standard care only . Aim: Evaluate the impact of educational intervention for pregnant diabetic women on their awareness regarding diet and exercise. Subjects and methods: Quasi experimental  Research – design was carried out in this study, Sample size was estimated to be100 individuals divided into two groups, one control group (50 case) and one study group (50 case) conducted at the Obstetric and Gynecology department (Antenatal clinics) in Suez Canal University Hospital . Results: This study revealed that there are no statistical significant difference between two groups ( control and study) according their knowledge and practice about diet and exercises in pre intervention ,  the majority of pregnant diabetic women had a poor knowledge and bad practice toward diet and exercises. Also revealed that there high statistical significant difference in study group post intervention regarding to their knowledge and practice about diet and exercises compared to the control group that there are no statistical significant difference regarding to their knowledge and practice about diet and exercises post intervention. Conclusion: This study results showed that lifestyle of women with gestational diabetes was different from that of healthy pregnant women, so that dietary style, physical activity, prenatal self-care were more favorable in healthy pregnant women and pregnant diabetic women. Recommendations: it is important to counsel diabetic women regarding the pregnancy should be planned in women with preexisting diabetes, a strict metabolic control with near or near-normal glucose levels, reached through lifestyle modifications, a healthy diet, and an exercise planning program to avoid short and long term complications for maternal and perinatal complications.