Efficacy of Metformin as an Adjunct to Standard Antidepressant Therapy in Treating Depression Among Obese Patients

To evaluate the efficacy of metformin as an adjunct therapy in improving depressive symptoms and metabolic markers in newly diagnosed obese depressed patients on standard antidepressant therapy. investigator will compare between Two groups 1\. metformin group 2 placebo group Primary outcome measure will be the improvement in depressive symptoms, indicating by a reduction in Hamilton Depression Rating Scale (HAM-D) scores. Secondary outcome measures will include the assessment of oxidative stress markers, specifically by measuring the increase in enzymatic activity of superoxide dismutase, catalase, and glutathione peroxidase Investigators hypothesize that the addition of metformin to standard antidepressant treatment will result in a significant reduction in symptoms of depression among newly diagnosed obese individuals.