The present study aims to investigate whether alcohol consumption is reduced when participants are shown calorie information of alcohol products, compared with when calorie information is absent. We also wish to see whether alcohol consumption levels are reduced when changing the serving sizes available to participants.

We will examine the effect of alcohol calorie information on calorie and alcohol unit consumption in a semi-naturalistic real-world experiment by randomising pub quiz evenings to alcohol calorie information vs. absence of calorie information (control). Because current evidence for alcohol calorie information from online hypothetical choice experiments suggests any impact on alcohol consumption may be null or very small, we will compare and benchmark the size of any potential effect of alcohol calorie information to another public health alcohol intervention known to reduce alcohol consumption (alcohol serving size). We will achieve this by also randomizing evenings to normal sized servings of alcohol (control) vs. reduced serving sizes. In addition to examining effects of interventions on what people drink and eat during the pub quiz, we will examine alcohol and energy intake after the pub quiz to probe for potential compensatory behaviour in response to interventions. Because it is currently unclear how useful consumers find alcohol information when implemented in real-world conditions, we will also examine the extent to which participants perceive the interventions to be effective.

Inclusion Criteria:

• Consume alcohol on a regular basis (at least one UK unit per week)
• Be aged 18 or over

Exclusion Criteria:

• Have a current or previously diagnosed alcohol use disorder

An anonymised data set will be published on the open science framework for anyone to access.

Data will be available after data collection has finished, this will be available indefinitely.