Impact of wine bottle and glass sizes on wine consumption at home: a within‐and between‐households randomized controlled trial

Eleni Mantzari*, Minna Ventsel, Jennifer Ferrar, Mark A. Pilling, Gareth J. Hollands, Theresa M. Marteau

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)
55 Downloads (Pure)

Abstract

Abstract
Background and aims
Reducing alcohol consumption across populations would decrease the risk of a range of diseases, including many cancers, cardiovascular disease and Type 2 diabetes. The aim of the current study was to estimate the impact of using smaller bottles (37.5- versus 75-cl) and glasses (290 versus 370 ml) on consuming wine at home.

Design
Randomized controlled trial of households with cross-over randomization to bottle size and parallel randomization to glass size.

Setting
UK households.

Participants
A total of 260 households consuming at least two 75-cl bottles of wine each week, recruited from the general population through a research agency. The majority consisted of adults who were white and of higher socio-economic position.

Intervention
Households were randomized to the order in which they purchased wine in 37.5- or 75-cl bottles, to consume during two 14-day intervention periods, and further randomized to receive smaller (290 ml) or larger (350 ml) glasses to use during both intervention periods.

Measurements
Volume (ml) of study wine consumed at the end of each 14-day intervention period, measured using photographs of purchased bottles, weighed on study scales.

Findings
Of the randomized households, 217 of 260 (83%) completed the study as per protocol and were included in the primary analysis. There was weak evidence that smaller bottles reduced consumption: after accounting for pre-specified covariates, households consumed on average 145.7 ml (3.6%) less wine when drinking from smaller bottles than from larger bottles [95% confidence intervals (CI) = –335.5 to 43. ml; −8.3 to 1.1%; P = 0.137; Bayes factor (BF) = 2.00]. The evidence for the effect of smaller glasses was stronger: households consumed on average 253.3 ml (6.5%) less wine when drinking from smaller glasses than from larger glasses (95% CI = –517 to 10 ml; −13.2 to 0.3%; P = 0.065; BF = 2.96).

Conclusions
Using smaller glasses to drink wine at home may reduce consumption. Greater uncertainty remains around the possible effect of drinking from smaller bottles.
Original languageEnglish
Pages (from-to)3037-3048
Number of pages12
JournalAddiction
Volume117
Issue number12
Early online date18 Jul 2022
DOIs
Publication statusPublished - 18 Jul 2022

Bibliographical note

Funding Information:
The study was funded by a Collaborative Award in Science from Wellcome Trust (Behaviour Change by Design: 206853/Z/17/Z), awarded to Theresa Marteau, Paul Fletcher, Gareth Hollands and Marcus Munafo. The funder had no involvement in any part of the study, including in the writing of the manuscript and the decision to submit it for publication. The views expressed in this publication are those of the author(s) and not necessarily those of Wellcome Trust. For the purpose of Open Access, the author has applied a CC BY public copyright licence to any Author Accepted Manuscript version arising from this submission. The authors are grateful to Britt Kilian and James Brimicombe for their help with developing the database for the study and to Laura Brocklebank for assisting in developing study materials and data collection in the early phase of the study. They are also grateful to Angela Attwood, Jon Heron, Marcus Munafò and Rachel Pechey for helpful comments on a draft of this manuscript.

Publisher Copyright:
© 2022 The Authors. Addiction published by John Wiley & Sons Ltd on behalf of Society for the Study of Addiction.

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