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Evaluation of physical activity calorie equivalent (PACE) labels’ impact on energy purchased in cafeterias: A stepped-wedge randomised controlled trial

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Listed:
  • James P Reynolds
  • Minna Ventsel
  • Alice Hobson
  • Mark A Pilling
  • Rachel Pechey
  • Susan A Jebb
  • Gareth J Hollands
  • Theresa M Marteau

Abstract

Background: A recent meta-analysis suggested that using physical activity calorie equivalent (PACE) labels results in people selecting and consuming less energy. However, the meta-analysis included only 1 study in a naturalistic setting, conducted in 4 convenience stores. We therefore aimed to estimate the effect of PACE labels on energy purchased in worksite cafeterias in the context of a randomised study design. Methods and findings: A stepped-wedge randomised controlled trial (RCT) was conducted to investigate the effect of PACE labels (which include kcal content and minutes of walking required to expend the energy content of the labelled food) on energy purchased. The setting was 10 worksite cafeterias in England, which were randomised to the order in which they introduced PACE labels on selected food and drinks following a baseline period. There were approximately 19,000 workers employed at the sites, 72% male, with an average age of 40. The study ran for 12 weeks (06 April 2021 to 28 June 2021) with over 250,000 transactions recorded on electronic tills. The primary outcome was total energy (kcal) purchased from intervention items per day. The secondary outcomes were: energy purchased from non-intervention items per day, total energy purchased per day, and revenue. Regression models showed no evidence of an overall effect on energy purchased from intervention items, −1,934 kcals per site per day (95% CI −5,131 to 1,262), p = 0.236, during the intervention relative to baseline, equivalent to −5 kcals per transaction (95% CI −14 to 4). There was also no evidence for an effect on energy purchased from non-intervention items, −5 kcals per site per day (95% CI −513 to 504), p = 0.986, equivalent to 0 kcals per transaction (95% CI −1 to 1), and no clear evidence for total energy purchased −2,899 kcals per site (95% CI −5,810 to 11), p = 0.051, equivalent to −8 kcals per transaction (95% CI −16 to 0). Study limitations include using energy purchased and not energy consumed as the primary outcome and access only to transaction-level sales, rather than individual-level data. Conclusion: Overall, the evidence was consistent with PACE labels not changing energy purchased in worksite cafeterias. There was considerable variation in effects between cafeterias, suggesting important unmeasured moderators. Trial registration: The study was prospectively registered on ISRCTN (date: 30.03.21; ISRCTN31315776). In a stepped-wedge randomized controlled trial, James Reynolds and colleagues investigate the impact of physical activity calorie equivalent (PACE) labels’ on energy purchased in worksite cafeterias in England.Why was this study done?: What did the researchers do and find?: What do these findings mean?:

Suggested Citation

  • James P Reynolds & Minna Ventsel & Alice Hobson & Mark A Pilling & Rachel Pechey & Susan A Jebb & Gareth J Hollands & Theresa M Marteau, 2022. "Evaluation of physical activity calorie equivalent (PACE) labels’ impact on energy purchased in cafeterias: A stepped-wedge randomised controlled trial," PLOS Medicine, Public Library of Science, vol. 19(11), pages 1-18, November.
    • Handle: RePEc:plo:pmed00:1004116
    DOI: 10.1371/journal.pmed.1004116
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    References listed on IDEAS

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    1. Gareth J. Hollands & Giacomo Bignardi & Marie Johnston & Michael P. Kelly & David Ogilvie & Mark Petticrew & Andrew Prestwich & Ian Shemilt & Stephen Sutton & Theresa M. Marteau, 2017. "The TIPPME intervention typology for changing environments to change behaviour," Nature Human Behaviour, Nature, vol. 1(8), pages 1-9, August.
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