title: Changes of dietary patterns during participation in a web-based weight-reduction programme.
abstract: OBJECTIVE
  To examine the weight-loss success associated with distinct dietary patterns and to determine changes of these dietary patterns during participation in a web-based weight-reduction programme.
  
  
  METHODS
  Factor analysis was used to identify the dietary patterns of twenty-two food groups that were administered in 14 d dietary protocols at baseline and after 3 months. Successful weight loss (≥5% of initial weight) and BMI were calculated. Logistic regression analyses were used to assess the rates of weight-loss success from each dietary pattern and changing or remaining in the initial dietary pattern. A generalised linear mixed model was used to estimate the effects of changing or staying in a dietary pattern on change in BMI.
  
  
  METHODS
  Adults (n 1635) aged 18-81 years.
  
  
  METHODS
  Users of a web-based weight-reduction programme (2006-2012).
  
  
  RESULTS
  Participants who aligned to a healthful dietary pattern at baseline (OR=1·8; 95% CI 1·5, 2·3) and after 3 months (OR=1·5; 95% CI 1·2, 1·9) had a greater chance of successfully losing weight. After adjusting for age, sex, initial dietary pattern and BMI, participants who started with or changed to the healthful dietary pattern had a greater chance of being successful (OR=1·4; 95% CI 1·1, 1·7) and a higher BMI reduction of 0·30 (95% CI 0·2, 0·5) kg/m(2) compared with those who started with or changed to the energy-dense or high-carbohydrate dietary pattern.
  
  
  CONCLUSIONS
  A favourable healthful dietary pattern at the beginning and after 3 months was positively associated with anthropometry. However, successful weight loss was feasible in each dietary pattern.
authors.affiliation: 1Institute of Social Medicine,Centre for Public Health,Medical University of Vienna,Kinderspitalgasse 15/I,1090 Vienna,Austria.
authors.forename: Eva
authors.initials: E
authors.lastname: Luger
authors.affiliation: 2KiloCoach Internetportale GmbH,Vienna,Austria.
authors.forename: Rosa
authors.initials: R
authors.lastname: Aspalter
authors.affiliation: 3Division of Endocrinology and Metabolism,Department of Internal Medicine III,Medical University of Vienna,Vienna,Austria.
authors.forename: Maria
authors.initials: M
authors.lastname: Luger
authors.affiliation: 2KiloCoach Internetportale GmbH,Vienna,Austria.
authors.forename: Rita
authors.initials: R
authors.lastname: Longin
authors.affiliation: 1Institute of Social Medicine,Centre for Public Health,Medical University of Vienna,Kinderspitalgasse 15/I,1090 Vienna,Austria.
authors.forename: Anita
authors.initials: A
authors.lastname: Rieder
authors.affiliation: 1Institute of Social Medicine,Centre for Public Health,Medical University of Vienna,Kinderspitalgasse 15/I,1090 Vienna,Austria.
authors.forename: Thomas Ernst
authors.initials: TE
authors.lastname: Dorner
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D050528:Diet, Carbohydrate-Restricted; D000072001:Diet, Healthy; D002149:Energy Intake; D015444:Exercise; D005260:Female; D006801:Humans; D020407:Internet; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D015431:Weight Loss; D061217:Weight Reduction Programs / Q000379:methods*; D055815:Young Adult
keywords: Dietary patterns; Factor analysis; Online weight-reduction programme; Weight loss