Weight reduction by lifestyle changes or with different pharmacological preparations have in many studies not made lasting long term results. Obesity surgery has so far been the only way to achieve permanent weight loss. During the 1980s, restrictive procedures were performed, e.g., vertical banded gastro-plasty (VBG) with good but unfortunately transient effect. Later developed, is the now prevalent gastric bypass procedure (GBP) which today uses the keyhole technique and causes combined restrictive and mal-absorptive changes in gastrointestinal anatomy.