Aim: The aim of the study was to evaluate nutritional deficiencies 1 year post OAGB among. pre and post bariatric surgery patients. Material and method: The present study was conducted among 80 subjects in the department of physiology at BJS Dental College, Ludhiana with the help of gastro surgery department of SPS hospital, Ludhiana among the patients who underwent OAGB surgery in the past one year. Following surgery, all-patients received standard dietary and lifestyle recommendations which were the same as those given for “standard” (Roux-en-Y) gastric bypass including iron-rich multivitamin, calcium, vitamin D and vitamin B12 supplementation. Pre-surgery demographic data, anthropometrics, comorbidities, blood tests, supplementation use, physical activity and smoking habits were obtained from the patients’ medical records. Anthropometric measurements for weight and height which were measured on a digital medical scale, and BMI was calculated accordingly. Blood tests were collected for lipid profile, glucose profile, vitamin B12, vitamin D, folate, iron, ferritin, transferrin, blood count, albumin and total protein. Results: Mean weight (kg), BMI (kg/m2) before the surgery was 114.8±18.3 and 41.8±4.1and after the surgery, the same was found to be 77±12.7 and 26.9±3.8 respectively. Post surgery i.e. after one year, total protein (%low values), iron (%deficiency), vitamin B12 (% <350 pg/ml), folate (%deficiency), vitamin D (%insufficiency, <30 ng/ml) and vitamin D (%deficiency, <20 ng/ml) was revealed as 25.4, 24.1, 28.9, 11.7, 54.9 and 17.4 respectively. Conclusion: The results of the study concluded that substantial improvements in health and anthropometric parameters are found in the short-term follow-up after OAGB.