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American Association of Clinical Endocrinologists, The Obesity Society, and American Society for Metabolic & Bariatric Surgery Medical Guidelines for Clinical Practice are systematically developed statements to assist health‐care professionals in medical decision making for specific clinical conditions. Most of the content herein is based on literature reviews. In areas of uncertainty, professional judgment was applied. These guidelines are a working document that reflects the state of the field at the time of publication. Because rapid changes in this area are expected, periodic revisions are inevitable. We encourage medical professionals to use this information in conjunction with their best clinical judgment. The presented recommendations may not be appropriate in all situations. Any decision by practitioners to apply these guidelines must be made in light of local resources and individual patient circumstances. The American Society for Parenteral & Enteral Nutrition fully endorses sections of these guidelines that address the metabolic and nutritional management of the bariatric surgical patient.

ObjectiveThe purpose of this study was to learn whether preoperative eating habits can be used to predict outcome after vertical banded gastroplasty (VBG) and Roux-en-Y gastric bypass (RYGB).Background Summary

Box. Criteria for Patient Selection* Body weight Body weight Ն45 kg or 100% above ideal weight BMI Ն40 BMI Ն35 with medical comorbidities Failure of nonsurgical attempts at weight reduction Absence of endocrine disorders that can cause morbid obesity Psychological stability Absence of alcohol and drug abuse Understanding of how surgery causes weight loss Realization that surgery itself does not guarantee good results Preoperative psychological evaluation for selected patients *BMI indicates body mass index, calculated as weight in kilograms divided by the square of height in meters.

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