title: Gastric bypass may promote weight loss in overweight partners.
abstract: BACKGROUND
  Following bariatric surgery, patients are expected to implement diet and lifestyle changes that may be imitated by cohabitating family members. We hypothesize that cohabitating family members will lose weight and improve their eating behavior within 1 year after surgery.
  
  
  METHODS
  In this observational prospective study, family members of patients who had gastric bypass surgery (88 partners, 20 children ≥18 years old, and 25 children between 12 and 17 years old) were repeatedly assessed. Family members were asked to assess their weight and height before and 3, 6, and 12 months following bariatric surgery, and they filled out the Dutch Eating Behavior Questionnaire.
  
  
  RESULTS
  Between baseline and 1 year following surgery, 49 partners of patients who underwent gastric bypass surgery (66.2%) lost weight, 6 (8.1%) remained stable, and 19 (25.7%) gained weight. Body mass index of partners (P = .002), particularly of overweight partners (P < .001)-but not children-showed a small, significant decrease over time. No significant changes in eating behavior among partners or children were found.
  
  
  CONCLUSIONS
  The study indicates that gastric bypass surgery may have a ripple effect, with body weight in partners of patients decreasing over time. However, there is considerable variation in the postoperative weight loss of partners.
authors.affiliation: From the Departments of Internal Medicine (FA, MvV, DPMB, VEAG), Pediatrics (NNER, IAvR), Medical Psychology/Hospital Psychiatry (CH), and Pharmacy & Pharmacology (JHB), Slotervaart Hospital, Amsterdam, the Netherlands; the Department of Clinical and Health Psychology, Utrecht University, Utrecht, the Netherlands (RG); the Health Psychology Section, Department of Health Sciences, University Medical Centre Groningen, Groningen, the Netherlands (CH); the Department of Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands (DPMB, VEAG); and the Diabetes Centre/Department of Internal Medicine, VU University Medical Center, Amsterdam, the Netherlands (MD). Floor.Aarts@slz.nl.
authors.forename: Floor
authors.initials: F
authors.lastname: Aarts
authors.affiliation: From the Departments of Internal Medicine (FA, MvV, DPMB, VEAG), Pediatrics (NNER, IAvR), Medical Psychology/Hospital Psychiatry (CH), and Pharmacy & Pharmacology (JHB), Slotervaart Hospital, Amsterdam, the Netherlands; the Department of Clinical and Health Psychology, Utrecht University, Utrecht, the Netherlands (RG); the Health Psychology Section, Department of Health Sciences, University Medical Centre Groningen, Groningen, the Netherlands (CH); the Department of Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands (DPMB, VEAG); and the Diabetes Centre/Department of Internal Medicine, VU University Medical Center, Amsterdam, the Netherlands (MD).
authors.forename: Nalini N E
authors.initials: NN
authors.lastname: Radhakishun
authors.affiliation: From the Departments of Internal Medicine (FA, MvV, DPMB, VEAG), Pediatrics (NNER, IAvR), Medical Psychology/Hospital Psychiatry (CH), and Pharmacy & Pharmacology (JHB), Slotervaart Hospital, Amsterdam, the Netherlands; the Department of Clinical and Health Psychology, Utrecht University, Utrecht, the Netherlands (RG); the Health Psychology Section, Department of Health Sciences, University Medical Centre Groningen, Groningen, the Netherlands (CH); the Department of Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands (DPMB, VEAG); and the Diabetes Centre/Department of Internal Medicine, VU University Medical Center, Amsterdam, the Netherlands (MD).
authors.forename: Mariska
authors.initials: M
authors.lastname: van Vliet
authors.affiliation: From the Departments of Internal Medicine (FA, MvV, DPMB, VEAG), Pediatrics (NNER, IAvR), Medical Psychology/Hospital Psychiatry (CH), and Pharmacy & Pharmacology (JHB), Slotervaart Hospital, Amsterdam, the Netherlands; the Department of Clinical and Health Psychology, Utrecht University, Utrecht, the Netherlands (RG); the Health Psychology Section, Department of Health Sciences, University Medical Centre Groningen, Groningen, the Netherlands (CH); the Department of Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands (DPMB, VEAG); and the Diabetes Centre/Department of Internal Medicine, VU University Medical Center, Amsterdam, the Netherlands (MD).
authors.forename: Rinie
authors.initials: R
authors.lastname: Geenen
authors.affiliation: From the Departments of Internal Medicine (FA, MvV, DPMB, VEAG), Pediatrics (NNER, IAvR), Medical Psychology/Hospital Psychiatry (CH), and Pharmacy & Pharmacology (JHB), Slotervaart Hospital, Amsterdam, the Netherlands; the Department of Clinical and Health Psychology, Utrecht University, Utrecht, the Netherlands (RG); the Health Psychology Section, Department of Health Sciences, University Medical Centre Groningen, Groningen, the Netherlands (CH); the Department of Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands (DPMB, VEAG); and the Diabetes Centre/Department of Internal Medicine, VU University Medical Center, Amsterdam, the Netherlands (MD).
authors.forename: Ines A
authors.initials: IA
authors.lastname: von Rosenstiel
authors.affiliation: From the Departments of Internal Medicine (FA, MvV, DPMB, VEAG), Pediatrics (NNER, IAvR), Medical Psychology/Hospital Psychiatry (CH), and Pharmacy & Pharmacology (JHB), Slotervaart Hospital, Amsterdam, the Netherlands; the Department of Clinical and Health Psychology, Utrecht University, Utrecht, the Netherlands (RG); the Health Psychology Section, Department of Health Sciences, University Medical Centre Groningen, Groningen, the Netherlands (CH); the Department of Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands (DPMB, VEAG); and the Diabetes Centre/Department of Internal Medicine, VU University Medical Center, Amsterdam, the Netherlands (MD).
authors.forename: Chris
authors.initials: C
authors.lastname: Hinnen
authors.affiliation: From the Departments of Internal Medicine (FA, MvV, DPMB, VEAG), Pediatrics (NNER, IAvR), Medical Psychology/Hospital Psychiatry (CH), and Pharmacy & Pharmacology (JHB), Slotervaart Hospital, Amsterdam, the Netherlands; the Department of Clinical and Health Psychology, Utrecht University, Utrecht, the Netherlands (RG); the Health Psychology Section, Department of Health Sciences, University Medical Centre Groningen, Groningen, the Netherlands (CH); the Department of Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands (DPMB, VEAG); and the Diabetes Centre/Department of Internal Medicine, VU University Medical Center, Amsterdam, the Netherlands (MD).
authors.forename: Jos H
authors.initials: JH
authors.lastname: Beijnen
authors.affiliation: From the Departments of Internal Medicine (FA, MvV, DPMB, VEAG), Pediatrics (NNER, IAvR), Medical Psychology/Hospital Psychiatry (CH), and Pharmacy & Pharmacology (JHB), Slotervaart Hospital, Amsterdam, the Netherlands; the Department of Clinical and Health Psychology, Utrecht University, Utrecht, the Netherlands (RG); the Health Psychology Section, Department of Health Sciences, University Medical Centre Groningen, Groningen, the Netherlands (CH); the Department of Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands (DPMB, VEAG); and the Diabetes Centre/Department of Internal Medicine, VU University Medical Center, Amsterdam, the Netherlands (MD).
authors.forename: Dees P M
authors.initials: DP
authors.lastname: Brandjes
authors.affiliation: From the Departments of Internal Medicine (FA, MvV, DPMB, VEAG), Pediatrics (NNER, IAvR), Medical Psychology/Hospital Psychiatry (CH), and Pharmacy & Pharmacology (JHB), Slotervaart Hospital, Amsterdam, the Netherlands; the Department of Clinical and Health Psychology, Utrecht University, Utrecht, the Netherlands (RG); the Health Psychology Section, Department of Health Sciences, University Medical Centre Groningen, Groningen, the Netherlands (CH); the Department of Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands (DPMB, VEAG); and the Diabetes Centre/Department of Internal Medicine, VU University Medical Center, Amsterdam, the Netherlands (MD).
authors.forename: Michaela
authors.initials: M
authors.lastname: Diamant
authors.affiliation: From the Departments of Internal Medicine (FA, MvV, DPMB, VEAG), Pediatrics (NNER, IAvR), Medical Psychology/Hospital Psychiatry (CH), and Pharmacy & Pharmacology (JHB), Slotervaart Hospital, Amsterdam, the Netherlands; the Department of Clinical and Health Psychology, Utrecht University, Utrecht, the Netherlands (RG); the Health Psychology Section, Department of Health Sciences, University Medical Centre Groningen, Groningen, the Netherlands (CH); the Department of Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands (DPMB, VEAG); and the Diabetes Centre/Department of Internal Medicine, VU University Medical Center, Amsterdam, the Netherlands (MD).
authors.forename: Victor E A
authors.initials: VE
authors.lastname: Gerdes
mesh_terms: D000293:Adolescent; D000328:Adult; D005190:Family / Q000523:psychology*; D005247:Feeding Behavior; D005260:Female; D005500:Follow-Up Studies; D015390:Gastric Bypass / Q000523:psychology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D015431:Weight Loss; D055815:Young Adult
keywords: Body Mass Index; Gastric Bypass; Obesity; Weight Loss