Background: Prevention and control of obesity especially in type 2 diabetic patients depends mainly on patient education and motivation which are facilitated by sufficient patient's knowledge, attitude and practice. Objective: - To assess the impact of a health education intervention on the weight, knowledge, attitude and random blood sugar of overweight and mild obese type 2 diabetic patients. Subjects and methods: An interventional study was carried out on 142 overweight and mild obese type 2 diabetic patients attending diabetic outpatient clinic of Zagazig university hospitals divided equally into two groups (intervention and control). The study divided into three phases I pre intervention: - included questionnaire to assess socio demographic data, knowledge and attitude, clinical assessment and laboratory investigation. II intervention: - covered health education program. III post intervention: - done after 3 months from intervention included the same questionnaire to assess knowledge and attitude after intervention, clinical assessment, laboratory investigation. Results: there were statistically significant reduction in means of weight and random blood sugar from 92.3and 202.5 to 86.4 and 193.6 before and after intervention respectively in intervention group. Also, statistically significant improvement in total adequate knowledge and attitude changes about obesity and diabetes from 14.1% and 9.9% in pretest to 45.1% and 47.9% in posttest respectively in the interventional group. Conclusion: health education intervention was effective on weight, knowledge, attitude and random blood sugar among overweight and mild obese type 2 diabetic patients.