Obesity is a growing problem in most developed As well as developing countries. Bariatric surgery should be consider only for severe obese patients who have not been to lose weight other treatment options and who are at high risk life threatening problems. The objective of the study was to find out the role of diet in the post Bariatric surgery. This study was carried out in a period of 05 months (April-August 2014). Data was studied at of RG Stone Urology & Laparoscopy Hospital, New Delhi. This study reveals the effect of diet among the post bariatric surgery patient.