The main goal of the study is to provide accurate estimates of the one-, three-, and five-year benefits and risks of the three most common bariatric procedures. This study will involve 10 of PCORnet’s Clinical Data Research Networks (CDRNs) including 53 healthcare organizations and more than 60,000 bariatric patients, with 50 percent gastric bypass, 10 percent gastric banding, and 40 percent sleeve gastrectomy procedures.