Repository logo
 

Increasing the proportion of healthier foods available with and without reducing portion sizes and energy purchased in worksite cafeterias: protocol for a stepped-wedge randomised controlled trial.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Kosīte, Daina 
Rigby Dames, Brier 
Brocklebank, Laura A 
Pilling, Mark 

Abstract

BACKGROUND: Overconsumption of energy from food contributes to high rates of overweight and obesity in many populations. A promising set of interventions tested in pilot studies in worksite cafeterias, suggests energy intake may be reduced by increasing the proportion of healthier - i.e. lower energy - food options available, and decreasing portion sizes. The current study aims to assess the impact on energy purchased of i. increasing the proportion of lower energy options available; ii. combining this with reducing portion sizes, in a full trial. METHODS: A stepped-wedge randomised controlled trial in 19 worksite cafeterias, where the proportion of lower energy options available in targeted food categories (including main meals, snacks, and cold drinks) will be increased; and combined with reduced portion sizes. The primary outcome is total energy (kcal) purchased from targeted food categories using a pooled estimate across all sites. Follow-up analyses will test whether the impact on energy purchased varies according to the extent of intervention implementation. DISCUSSION: This study will provide the most reliable estimate to date of the effect sizes of two promising interventions for reducing energy purchased in worksite cafeterias. TRIAL REGISTRATION: The study was prospectively registered on ISRCTN (date: 24.05.19; TRN: ISRCTN87225572; doi: https://doi.org/10.1186/ISRCTN87225572).

Description

Keywords

Availability, Choice architecture, Healthier eating, Nudging, Obesity, Physical micro-environment interventions, Portion size, Randomised controlled trial, Stepped wedge trial, Workplace interventions, Adult, Female, Humans, Male, Consumer Behavior, Diet, Healthy, Energy Intake, Food Services, Food Supply, Meals, Obesity, Portion Size, Randomized Controlled Trials as Topic, Workplace, Multicenter Studies as Topic

Journal Title

BMC Public Health

Conference Name

Journal ISSN

1471-2458
1471-2458

Volume Title

19

Publisher

Springer Science and Business Media LLC
Sponsorship
Wellcome Trust (106679/Z/14/Z)
Wellcome Trust (206853/Z/17/Z)
Cancer Research UK (C4770/A29425)