title: Effects of dietary protein intake on body composition changes after weight loss in older adults: a systematic review and meta-analysis.
abstract: BACKGROUND
  The impact of dietary protein on body composition changes after older adults purposefully lose weight requires systematic evaluation
  
  
  OBJECTIVE
  : This systematic review and meta-analysis assessed the effects of protein intake (< 25% vs ≥ 25% of energy intake or 1.0 g/kg/d) on energy restriction-induced changes in body mass, lean mass, and fat mass in adults older than 50 years.
  
  
  METHODS
  PubMed, Cochrane, Scopus, and Google Scholar were searched using the keywords "dietary proteins," "body composition," "skeletal muscle," and "muscle strength."
  
  
  METHODS
  Two researchers independently screened 1542 abstracts.
  
  
  METHODS
  Information was extracted from 24 articles.
  
  
  RESULTS
  Twenty randomized control trials met the inclusion criteria.
  
  
  CONCLUSIONS
  Older adults retained more lean mass and lost more fat mass during weight loss when consuming higher protein diets.
authors.affiliation: J.E. Kim, L.E. O'Connor, and W.W. Campbell are with the Department of Nutrition Science, Purdue University, West Lafayette, Indiana, USA. L.P. Sands is with the Department of Human Development, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA. M.B. Slebodnik is with the Arizona Health Sciences Library, University of Arizona, Tuscon, USA.
authors.forename: Jung Eun
authors.initials: JE
authors.lastname: Kim
authors.affiliation: J.E. Kim, L.E. O'Connor, and W.W. Campbell are with the Department of Nutrition Science, Purdue University, West Lafayette, Indiana, USA. L.P. Sands is with the Department of Human Development, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA. M.B. Slebodnik is with the Arizona Health Sciences Library, University of Arizona, Tuscon, USA.
authors.forename: Lauren E
authors.initials: LE
authors.lastname: O'Connor
authors.affiliation: J.E. Kim, L.E. O'Connor, and W.W. Campbell are with the Department of Nutrition Science, Purdue University, West Lafayette, Indiana, USA. L.P. Sands is with the Department of Human Development, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA. M.B. Slebodnik is with the Arizona Health Sciences Library, University of Arizona, Tuscon, USA.
authors.forename: Laura P
authors.initials: LP
authors.lastname: Sands
authors.affiliation: J.E. Kim, L.E. O'Connor, and W.W. Campbell are with the Department of Nutrition Science, Purdue University, West Lafayette, Indiana, USA. L.P. Sands is with the Department of Human Development, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA. M.B. Slebodnik is with the Arizona Health Sciences Library, University of Arizona, Tuscon, USA.
authors.forename: Mary B
authors.initials: MB
authors.lastname: Slebodnik
authors.affiliation: J.E. Kim, L.E. O'Connor, and W.W. Campbell are with the Department of Nutrition Science, Purdue University, West Lafayette, Indiana, USA. L.P. Sands is with the Department of Human Development, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA. M.B. Slebodnik is with the Arizona Health Sciences Library, University of Arizona, Tuscon, USA. campbellw@purdue.edu.
authors.forename: Wayne W
authors.initials: WW
authors.lastname: Campbell
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism*; D000368:Aged; D001823:Body Composition / Q000187:drug effects* / Q000502:physiology; D001835:Body Weight; D004032:Diet; D004044:Dietary Proteins / Q000008:administration & dosage / Q000494:pharmacology*; D002149:Energy Intake / Q000502:physiology; D006801:Humans; D018482:Muscle, Skeletal / Q000378:metabolism*; D015431:Weight Loss / Q000502:physiology*
chemical_list: D004044:Dietary Proteins
keywords: aging; body composition; obesity; protein