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This experimental lab study is to assess the impact on consumption of using larger (vs smaller) plates for self-serving food

The aim of this study is to estimate the impact of serving lager, ale and cider in straight-sided glasses on alcohol consumption in public houses and bars. Twenty-four public houses and bars in the UK will take part in this cluster randomised crossover trial. All participating venues will perform two intervention periods (A) and two control periods (B) in random order. Each period will last two weeks and will involve serving lager, ale and cider in either straight-sided glasses (intervention condition) or the venue's usual glasses (control condition). Data on the volume (in ml) of lager, ale and cider sold will be collected and compared between intervention and control periods.

The primary aim of this online study is to assess whether altering the proportion of alcohol-free drinks compared to alcoholic drinks and the provision of calorie information affects the selection of an alcohol-free drink over an alcoholic drink. The secondary aim is to examine the impact of using a gamified task compared to a non-gamified control task on participant engagement.

The aim of this study is to estimate the impact of increasing the availability of non-alcoholic drinks (i.e., soft drinks and alcohol-free beer) vs alcoholic drinks (i.e., beer) on the type of drink selected (non-alcoholic or alcoholic). Participants are UK adults who consume alcohol weekly, recruited to an online experimental study. Participants make a hypothetical selection from a range of non-alcoholic and alcoholic drink options. They are randomly assigned to one of eight conditions, in a 4 (availability) x 2 (cognitive resource) factorial design. The availability factor includes four conditions: i) reference 1: two non-alcoholic drinks and two beers, ii) reference 2: four non-alcoholic drinks and four beers, iii) increased non-alcoholic: six non-alcoholic drinks and two beers, iv) increased alcohol: two non-alcoholic drinks and six beers. The cognitive resource factor includes two conditions: i) high time pressure, ii) low time pressure. The primary outcome is the proportion of participants selecting a non-alcoholic drink (vs an alcoholic drink).

Background: Point of sale (POS) displays of tobacco products are now prohibited in the UK. However, displays of e-cigarettes and smoking paraphernalia – e.g., cigarette lighters – are often located alongside cabinets holding tobacco products. The nature and prevalence of these displays is currently unknown. Aim: The aim of this naturalistic observational study is to describe the nature and prevalence of e-cigarettes and smoking paraphernalia at POS displays in major retailers of tobacco in two cities in England. Methods: A total of 150 stores will be sampled from major retailers of tobacco in Bristol and Cambridge, England, comprising three large supermarket chains and convenience stores located in areas of high, medium and low deprivation. Measures of product visibility and placement will be recorded using a standardised checklist, additionally, POS displays will be photographed where permission is granted. Discussion: The results of this study will inform the design of other studies to evaluate the impact of these displays on urges to smoke in children and adults.

Two online studies to investigate the impact of health warning labels on selection of alcohol

This new registration is to register the uploading of an updated data analysis plan for intervention 2 of the study.

This is a pre-registration of the detailed statistical analysis plan, before any analyses are conducted.

This study aims to investigate two methods of promoting sustainable diets. One method involves eco-labeling and the other involves utilising social norms to nudge people towards sustainable choices. The primary research aim is to determine the effects of these two methods on food choice and the secondary research aim is to investigate how participants' motivation to live sustainably impacts these effects. The study has three conditions, one for each method and one control condition. Participants will be presented different variations of a food menu depending on their condition. We will measure the food choice frequency and participants' motivation to live sustianably.

This is a pre-registration of an updated version of the detailed statistical analysis plan, before any analyses are conducted.

An online experimental study, with a two-group between subjects design, aiming to assess whether adding the term ‘milk’ to labels of milk substitutes would: 1) more accurately communicate the use of milk substitutes to consumers, and 2) confuse consumers about which products come from an animal source. Participants will be equally randomised to one of two conditions in a between-subjects design: No Milk Labelling Condition where milk substitutes are not labelled with the term milk and Milk Labelling Condition where milk substitutes are labelled with the term milk. The primary outcome is the number of milk substitutes the participant correctly identifies as being a product that could be added to a cup of tea or coffee. The secondary outcome is the number of milk substitutes the participant misidentifies as being from an animal source.

The aim of this study is to estimate the impact of exposure to two different types of e cigarette cues on tobacco smoking and vaping urges. Four groups of UK adults, varying in smoking (i.e., current or former) and vaping (i.e., uses or does not use) status, will be randomly assigned to view one of four short videos and complete a questionnaire online. The videos will show the same conversation between two actors but vary in the following: (a) someone vapes using a cigalike e-cigarette; (b) someone vapes using a tank-system e-cigarette; (c) someone smokes a tobacco cigarette, (d) someone performs an action involving hand and face that does not involve vaping or smoking.

This study aims to estimate the impact of exposure to e-cigarette retail displays on smoking susceptibility in children. We will recruit 1,000 participants (aged 13-17) to an online experiment using a 2x2 between-subjects design, with two factors: i. E-cigarette retail display visibility (high vs low), and ii. Proportion of e-cigarette images (75% vs 25%). Participants will be randomised to one of four groups, each displaying an image set comprising 12 images of retail displays that are of either high or low e-cigarette display visibility and containing high or low proportions of e-cigarette images or unrelated retail products (e.g., stationery). The primary outcome is susceptibility to tobacco smoking, assessed using a three-item measure (Pierce, 1996).

This is a registration of an updated analysis plan, prior to the analyses being conducted. To better inform a UK government proposal to consult on an intention to make companies provide alcohol calorie labelling, as part of an obesity strategy, we have added calories selected and purchased as additional secondary outcomes.

The aim of this study is to estimate the impact of glass weight on the rate of alcohol consumption among social drinkers. One hundred and forty-eight (148) participants will take part in this randomised controlled trial. Participants will be randomised to one of two experimental conditions: 1) Heavy: participants will be asked to consume 330ml of lager (Heineken [ABV 5%]) from a heavier than normal pint glass (660g to 680g). 2) Standard (control): participants will be asked to consume 330ml of lager from a normal pint glass (454g to 460g). The primary outcome will be total drinking time (in seconds). We hypothesise that social drinkers will consume 330ml of lager more slowly from a heavy pint glass compared to a standard pint glass. To explore potential mechanisms, the following secondary outcomes will also be measured: 1) number of times the glass is put down between sips; and 2) drink enjoyment.

Two online studies to investigate the impact of health warning labels on selection of alcohol

The aim of this study is to assess the impact of altering serving sizes of beer and wine in licensed premises on alcohol sales, a proxy for alcohol consumption. The study assesses two distinct interventions: 1. Adding a two-third pint option for beer and cider sold on tap; 2. Removing the largest serving size for a glass of wine. A minimum of 19 sites will be recruited and a reversal design will be used for each intervention with serving sizes changed twice over three four-week periods.

The aim of this pilot and feasibility study is to inform the design of a larger randomised controlled trial (RCT) to estimate the impact of drinking position (sitting vs. standing) on the rate of alcohol consumption and to determine whether it is moderated by the availability of a table. The primary aim is to inform the sample size of a larger RCT by measuring total drinking times of alcoholic beverages in four conditions. The secondary aim is to assess the feasibility of the study and the fidelity to protocol.

This is a pre-registration of the detailed statistical analysis plan, before any analyses are conducted.

The aim of this study is to estimate the impact of increasing the proportion (i.e., the relative availability) of draught alcohol-free beer on alcohol consumption in bars and public houses. The study is a randomised four-period crossover trial where all participating sites (bars and public houses) will perform two intervention periods and two control periods. During the intervention periods, sites will remove one draught alcoholic beer and replace it with one draught alcohol-free beer. During the control periods, sites will have no alcohol-free beer on draught (i.e., usual practice).​ The primary outcome is the mean volume (in litres) of draught alcoholic beer (lager and ale combined) sold weekly.

Additional file 1. Cigarette pack size and consumption: a pilot randomised controlled trial.

Additional file 2. Missing data and inconsistent responses.

Additional file 1. Supplementary material.