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  • Katherine M Livingstone
  • Carlos Celis-Morales
  • Anna L Macready
  • Hannah Forster
  • Clara Woolhead
  • Clare B O'Donovan
  • Cyril Fm Marsaux
  • Santiago Navas-Carretero
  • Rodrigo San-Cristobal
  • Silvia Kolossa
  • Lydia Tsirigoti
  • Christina P Lambrinou
  • George Moschonis
  • Agnieszka Surwiłło
  • Christian A Drevon
  • Yannis Manios
  • Iwona Traczyk
  • Eileen R Gibney
  • Lorraine Brennan
  • Marianne C Walsh
  • Julie A Lovegrove
  • J Alfredo Martinez
  • Wim Hm Saris
  • Hannelore Daniel
  • Mike Gibney
  • John C Mathers
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Original languageEnglish
Number of pages11
Pages (from-to)1-11
JournalPublic Health Nutrition
Journal publication date5 Aug 2016
DOIs
Publication statusPublished - 5 Aug 2016

Abstract

OBJECTIVE: To characterise participants who dropped out of the Food4Me Proof-of-Principle study.

DESIGN: The Food4Me study was an Internet-based, 6-month, four-arm, randomised controlled trial. The control group received generalised dietary and lifestyle recommendations, whereas participants randomised to three different levels of personalised nutrition (PN) received advice based on dietary, phenotypic and/or genotypic data, respectively (with either more or less frequent feedback).

SETTING: Seven recruitment sites: UK, Ireland, The Netherlands, Germany, Spain, Poland and Greece.

SUBJECTS: Adults aged 18-79 years (n 1607).

RESULTS: A total of 337 (21 %) participants dropped out during the intervention. At baseline, dropouts had higher BMI (0·5 kg/m2; P<0·001). Attrition did not differ significantly between individuals receiving generalised dietary guidelines (Control) and those randomised to PN. Participants were more likely to drop out (OR; 95 % CI) if they received more frequent feedback (1·81; 1·36, 2·41; P<0·001), were female (1·38; 1·06, 1·78; P=0·015), less than 45 years old (2·57; 1·95, 3·39; P<0·001) and obese (2·25; 1·47, 3·43; P<0·001). Attrition was more likely in participants who reported an interest in losing weight (1·53; 1·19, 1·97; P<0·001) or skipping meals (1·75; 1·16, 2·65; P=0·008), and less likely if participants claimed to eat healthily frequently (0·62; 0·45, 0·86; P=0·003).

CONCLUSIONS: Attrition did not differ between participants receiving generalised or PN advice but more frequent feedback was related to attrition for those randomised to PN interventions. Better strategies are required to minimise dropouts among younger and obese individuals participating in PN interventions and more frequent feedback may be an unnecessary burden.

Notes

This article has been published in a revised form in Public Health Nutrition [http://dx.doi.org/10.1017/S1368980016002020. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works. © 2016 The Authors.

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