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2% to 24.4% in males, and 16.4% to 25.1% in females.1 In UK surgical practice, 30% of patients are identified as obese.2 Obesity is a known risk factor for several medical morbidities, including cardiovascular disease and diabetes. It has also been associated with an increased risk of several malignancies, including cancer of the colon and oesophagus.3 Conflicting evidence exists regarding the impact of obesity on postoperative complications following gastrointestinal surgery. A study of over 6?000 patients demonstrated no difference in mortality and postoperative morbidity for obese and non-obese patients.4 Recent studies have identified an obesity paradox, with moderate obesity offering protection from adverse events, whereas underweight patients are at greater risk.5 6 However, other reports have suggested obesity is associated with an increased risk of surgical-site infection and venous thromboembolism.7�C9 The need for further evidence Most studies exploring the role of obesity in determining postoperative complication rates have either been single centre, retrospective PDE4B cohort studies or secondary analyses of previously collected data. There is a need for a multicentre prospective study that is primarily designed to address whether obesity is associated with an increased risk of postoperative complications. Detailed patient background should be collected in order to risk-adjust outcomes for potential confounders such as preoperative cardiac risk and socioeconomic status. Primary aim The primary aim of the Determining Surgical Complications in the Overweight (DISCOVER) study is to determine whether obesity is associated with an increased risk of postoperative complications following gastrointestinal, bariatric and hepatobiliary surgery. Hypothesis The 30-day major postoperative complication rate, following risk adjustment, should be equivalent in obese and non-obese patients. Methods Study design A national multicentre prospective cohort study disseminated through collaborative university medical school and student networks (figure 1). The generic collaborative methodology has been described previously.10 Figure?1 STARSurg ��Mini-Team�� structure, roles and responsibilities. The STARSurg network Student Audit and Research in Surgery (STARSurg) is the UK's national medical student research collaborative coordinated by a team of medical students and supervisors. Given common problems faced by students wishing to engage in high-quality extracurricular academic projects,11 the STARSurg network was formed to empower participation by forming links with supervising junior doctors and consultants. Through this, students contribute data to national studies while gaining an understanding of clinical academia, audit and research methodology and ethical considerations.