en Bariatric Surgery Bariatric Surgery Letter/Editorial Letter/Editorial Obesity and obesity related comorbidities are increasing worldwide. Bariatric surgery plays a key role in treatment of morbid obesity and its related diseases. Bariatric procedures have been evolved in decades from initial procedures to modern and standard procedures. This evolution is continuing now to reach better and more persistent results with lower complications’ rates. In this manuscript we tell a brief history of this development. Obesity, Bariatric surgery, History, Obesity surgery 1 4 http://annbsurg.iums.ac.ir/browse.php?a_code=A-10-27-1&slc_lang=en&sid=1 Mohammad Taghi Rezaei rezaei.mohammadtaghi@gmail.com 10031947532846001372 10031947532846001372 No Mehrad Hospital, Tehran, Iran Mohammad Kermansaravi Email: kermansaravi.m@iums.ac.ir 10031947532846001373 10031947532846001373 Yes Minimally Invasive Surgery Research Center, Division of Minimally Invasive and Bariatric Surgery, Department of Surgery. Rasool-e Akram Hospital, Iran University of Medical Sciences, Tehran, Iran - Center of Excellence of European Branch of International Federation for Surgery of Obesity, Hazrat_e Rasool Hospital, Tehran, Iran