title: Influence of dietary protein and its amino acid composition on postoperative outcomes after gastric bypass surgery: a systematic review.
abstract: Bariatric surgery is an effective method to reduce morbid obesity. Nutritional counseling is essential to achieve maximal treatment success and to avoid long-term complications. Increased dietary protein intake may improve various postoperative results.
  
  
  
  The aim of this systematic review is to examine the relationship between intake of dietary protein or supplementation with amino acids and postoperative outcomes after gastric bypass surgery.
  
  
  
  A systematic literature search was conducted in 4 electronic databases: Cochrane, Embase, PubMed, and Scopus.
  
  
  
  The initial search retrieved 7333 hits, which included 2390 duplicates.
  
  
  
  Tweny-three studies with varying study designs, interventions, and outcomes were included.
  
  
  
  Studies did not provide convincing evidence of a beneficial effect on any postoperative outcome.
  
  
  
  The study of the influence of protein and its amino acid composition represents an important developing domain of knowledge and warrants further attention considering the popularity of bariatric surgery. Future studies should include a clear description of the quantity and composition of proteins and amino acids in the diet or supplement.
authors.affiliation: M. van den Broek and L.J.M. de Heide are with the Department of Internal Medicine, Medical Center Leeuwarden, Leeuwarden, the Netherlands. N.J.G.M. Veeger is with the Department of Epidemiology, Medical Center Leeuwarden, Leeuwarden, the Netherlands. N.J.G.M. Veeger is with the Department of Epidemiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands. A.M. van der Wal-Oost is with the MCL Academy, Medical Center Leeuwarden, Leeuwarden, the Netherlands. A.P. van Beek is with the Department of Endocrinology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands. merel.van.den.broek@znb.nl.
authors.forename: Merel
authors.initials: M
authors.lastname: van den Broek
authors.affiliation: M. van den Broek and L.J.M. de Heide are with the Department of Internal Medicine, Medical Center Leeuwarden, Leeuwarden, the Netherlands. N.J.G.M. Veeger is with the Department of Epidemiology, Medical Center Leeuwarden, Leeuwarden, the Netherlands. N.J.G.M. Veeger is with the Department of Epidemiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands. A.M. van der Wal-Oost is with the MCL Academy, Medical Center Leeuwarden, Leeuwarden, the Netherlands. A.P. van Beek is with the Department of Endocrinology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
authors.forename: Loek J M
authors.initials: LJ
authors.lastname: de Heide
authors.affiliation: M. van den Broek and L.J.M. de Heide are with the Department of Internal Medicine, Medical Center Leeuwarden, Leeuwarden, the Netherlands. N.J.G.M. Veeger is with the Department of Epidemiology, Medical Center Leeuwarden, Leeuwarden, the Netherlands. N.J.G.M. Veeger is with the Department of Epidemiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands. A.M. van der Wal-Oost is with the MCL Academy, Medical Center Leeuwarden, Leeuwarden, the Netherlands. A.P. van Beek is with the Department of Endocrinology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
authors.forename: Nic J G M
authors.initials: NJ
authors.lastname: Veeger
authors.affiliation: M. van den Broek and L.J.M. de Heide are with the Department of Internal Medicine, Medical Center Leeuwarden, Leeuwarden, the Netherlands. N.J.G.M. Veeger is with the Department of Epidemiology, Medical Center Leeuwarden, Leeuwarden, the Netherlands. N.J.G.M. Veeger is with the Department of Epidemiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands. A.M. van der Wal-Oost is with the MCL Academy, Medical Center Leeuwarden, Leeuwarden, the Netherlands. A.P. van Beek is with the Department of Endocrinology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
authors.forename: Alies M
authors.initials: AM
authors.lastname: van der Wal-Oost
authors.affiliation: M. van den Broek and L.J.M. de Heide are with the Department of Internal Medicine, Medical Center Leeuwarden, Leeuwarden, the Netherlands. N.J.G.M. Veeger is with the Department of Epidemiology, Medical Center Leeuwarden, Leeuwarden, the Netherlands. N.J.G.M. Veeger is with the Department of Epidemiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands. A.M. van der Wal-Oost is with the MCL Academy, Medical Center Leeuwarden, Leeuwarden, the Netherlands. A.P. van Beek is with the Department of Endocrinology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
authors.forename: André P
authors.initials: AP
authors.lastname: van Beek
mesh_terms: D000596:Amino Acids / Q000008:administration & dosage*; D004032:Diet; D004044:Dietary Proteins / Q000008:administration & dosage*; D019587:Dietary Supplements; D015390:Gastric Bypass; D006801:Humans; D009767:Obesity, Morbid / Q000601:surgery; D016896:Treatment Outcome
chemical_list: D000596:Amino Acids; D004044:Dietary Proteins
keywords: amino acids; diet; gastric bypass; postoperative outcomes; protein; weight loss