title: Effect of Protein Intake on the Protein Status and Lean Mass of Post-Bariatric Surgery Patients: a Systematic Review.
abstract: Post-bariatric surgery may compromise nutritional status due to energy and protein intake restriction.
  
  
  
  Systematic review was performed to synthesize evidence on the amount of protein intake and its association with lean mass and serum proteins during at least 6 months following Roux-en-Y gastric bypass or sleeve gastrectomy.
  
  
  
  Twelve studies (n = 739) were identified in the search. Protein intake below 60 g/day and significant lean mass loss were observed in majority of these studies. Of the four studies that measured association between protein intake and lean mass retention, only two supported this hypothesis.
  
  
  
  There is insufficient evidence of the effect of dietary protein on serum protein levels. Further studies are needed to better estimate the protein intake that supports a healthy nutritional status in this population.
authors.affiliation: Department of Nutrition, Graduate Program in Human Nutrition, University of Brasilia, Brasilia, DF, Brazil.
authors.forename: Marina Kiyomi
authors.initials: MK
authors.lastname: Ito
authors.affiliation: Department of Nutrition, Graduate Program in Human Nutrition, University of Brasilia, Brasilia, DF, Brazil.
authors.forename: Vivian Siqueira Santos
authors.initials: VSS
authors.lastname: Gonçalves
authors.affiliation: Department of Nutrition, Graduate Program in Human Nutrition, University of Brasilia, Brasilia, DF, Brazil. silvialeitefaria@gmail.com.|Gastrocirurgia de Brasilia, Brasilia, DF, Brazil. silvialeitefaria@gmail.com.
authors.forename: Silvia Leite Campos Martins
authors.initials: SLCM
authors.lastname: Faria
authors.affiliation: Obesity Unit, Hospital Clinic Universitari, Barcelona, Spain.
authors.forename: Violeta
authors.initials: V
authors.lastname: Moizé
authors.affiliation: Brazilian Centre for Evidence-based Research, Federal University of Santa Catarina, Florianopolis, Brazil.
authors.forename: André Luís
authors.initials: AL
authors.lastname: Porporatti
authors.affiliation: Laboratory of Oral Histopathology, Health Science Faculty, University of Brasilia, Brasília, DF, Brazil.
authors.forename: Eliete Neves Silva
authors.initials: ENS
authors.lastname: Guerra
authors.affiliation: Brazilian Centre for Evidence-based Research, Federal University of Santa Catarina, Florianopolis, Brazil.
authors.forename: Graziela
authors.initials: G
authors.lastname: De Luca Canto
authors.affiliation: Department of Nutrition, Graduate Program in Human Nutrition, University of Brasilia, Brasilia, DF, Brazil.
authors.forename: Kênia Mara Baiocchi
authors.initials: KMB
authors.lastname: de Carvalho
mesh_terms: D050110:Bariatric Surgery; D001798:Blood Proteins / Q000032:analysis; D015992:Body Mass Index; D004044:Dietary Proteins; D004435:Eating; D006801:Humans; D009752:Nutritional Status; D009767:Obesity, Morbid / Q000601:surgery*
chemical_list: D001798:Blood Proteins; D004044:Dietary Proteins
keywords: Bariatric surgery; Body composition; Lean mass; Protein intake; Serum protein, systematic review