Biliopancreatic diversion (BPD) is a bariatric operation of proved efficacy especially in patients with metabolic comorbidities. The aim was to assess the results of BPD in relation to weight loss and coexisting lipid and glucose metabolism disturbances in the Polish population. Between October 2001 and December 2003 57 morbidly obese patients (24 male and 33 female) underwent BPD. Median age was 46 years (range: 17-58) and median body mass index (BMI) was 50.2 kg/m(2) (range: 40.1-73 kg/m(2)). Type 2 diabetes mellitus was observed in 11 patients (19.3%), hypercholesterolaemia in 38 patients (66.7%) and hypertriglyceridaemia in 37 patients (64.9%). Median value of BMI decreased at three months to 40.0 kg/m(2), at six months to 36.7 kg/m(2), and after a year to 32.3 kg/m2. Diabetes was completely resolved in all patients. After six months, triglycerides and cholesterol levels were higher than normal only in one patient. Early specific complications that manifested as seroma and nosocomial pneumonia occurred in 5.3% and 3.5% patients, respectively. The following specific late complications were observed: ulceration of stomach stump (3.4%), anaemia (14.0%), hypoalbuminaemia (8.8%), deterioration of haemorrhoids (15.8). All of above complications were treated conservatively expect two haemorrhoidectomies. One patient died due to myocardial infarction eight months after BPD. Five cases of incisional hernias (8.8%) were found. BPD is an effective bariatric procedure also in the Polish population, resulting not only in weight loss but also in the improvement of lipid and glucose metabolism.