A reversal of defaults: Implementing a menu-based default nudge to promote out-of-home consumer adoption of plant-based meat alternatives

Identifying behaviour change techniques for sustainable food consumption: A systematic review using the BCTTv1

Due to the significant impact of Western diets on the environment, interventions are being trialled in supermarkets, restaurants, and other settings to encourage sustainable food consumption (SFC). The Behaviour Change Technique Taxonomy (BCTTv1) lists and categorises Behaviour Change Techniques (BCTs), which facilitates the development and understanding of behaviour change interventions. However, its applicability to pro-environmental behaviour change has not been extensively explored. This systematic review uses the BCTTv1 to identify the BCTs that have been previously used to encourage SFC behaviours. Studies were retrieved from Scopus, PSYCInfo, GreenFILE, and the Web of Science Core Collection. Twenty-six interventions across 19 articles were reviewed, enabling the identification of 13 BCTs which were coded using the BCTTv1 and categorised according to their target behaviour and effect size. The most frequently applied BCTs were 12.1 'restructuring the physical environment', which was used in the most effective interventions; 6.2 'social comparison', which was used in interventions with smaller and more unpredictable effects; 5.3 'information about social and environmental consequences'; 5.2 'salience of consequences'; and 7.1 'prompts/cues'. Despite challenges in assessing the BCTs' effectiveness due to multicomponent interventions and varying effects across different contexts, this review offers recommendations on changing SFC behaviour as well as the applicability of the BCTTv1 for SFC interventions.

Can behavioural nudges promote reduced-salt dish orders on meal delivery apps?

OBJECTIVES

This study aimed to evaluate the effectiveness of educational health message and menu default options on a Meal Delivery App (MDA) in nudging consumers towards reduced-salt options in restaurants of China.

STUDY DESIGN

We conducted a nudge-based intervention trial on an MDA named ELEME in China.

METHODS

Along with a control group, five intervention groups were formed utilizing different combinations of the three nudging treatments, including setting up a salt submenu for "reduced salt" default, a salt submenu for "regular salt" default, and a conventional educational health message on the ordering page. We recruited 903 restaurants from cities across different geographic regions and assigned them into either the control group or one of the five intervention groups.

RESULTS

After analyzing 870,942 meal orders, the results showed that the inclusion of a health message on the restaurants' ordering page was not effective to influence consumers to choose reduced-salt dishes (P > 0.1). A salt submenu that explicitly asked for consumers' preference for "reduced salt" or "regular salt" significantly increased consumers' likelihoods of choosing reduced-salt dishes in the unadjusted model (P < 0.1).

CONCLUSIONS

Applying choice architecture changes as nudge-based interventions on MDAs were proven to be effective to promote consumers to order reduced salt dishes, and we consider these findings to have real-world implications for policymakers, researchers, and the private sectors.

Reducing meat consumption through default nudging: a field study

Meat consumption negatively impacts ecological sustainability, health, and animal welfare. Research suggested promising effects of re-designing product arrangements so that vegetarian items become the default. However, whether default nudging leads to actual behaviour change in the context of meat consumption, and whether these effects are sustainable on the long-term remains unknown. Therefore, this field experiment investigated (a) the effect of vegetarian default nudging on food choices in a real-life setting, and (b) potential long-term associations between vegetarian defaults, food choices, and psychological resistance (i.e., reactance and inertia). A vegetarian default intervention was applied in a university cafeteria. Behavioural data (cafeteria sales data regarding meat and vegetarian purchases; N = 4,099) was collected before (T0; baseline), right after implementation (T1), and 10 weeks after implementation of the intervention (T2). Additionally, survey data was collected at T1 and T2 to assess potential psychological side-effects, such as resistance to the intervention. Results indicate that vegetarian default nudging was highly effective at changing food choices, with more than twice the number of vegetarian items sold relative to baseline. Moreover, in the default nudging condition, the number of meat items decreased to less than a third of the baseline measurement. At the same time, the survey data revealed no psychological side-effect of the intervention on reactance or inertia. This was stable over time. Our research offers empirical support for the effectiveness of a non-coercive strategy to change consumer behaviour towards more sustainable, animal friendly, and healthier food choices.

Goal-framing theory and sustainable food choices: Leveraging spillover to activate moral goals

Transitioning to plant-dominant dishes in the growing meal kit delivery market could significantly reduce the greenhouse gas emission footprint of the sector. However, many consumers choose meat-based options without considering plant-based alternatives when ordering food online. This scenario-based survey experiment with 669 consumers tested whether an environmental message between lunch and dinner would increase stated plant-based dinner choices. The findings show that the environmental message significantly increased plant-based dinner selections through two pathways. For consumers who chose a plant-based lunch, the message reinforced their environmental identity, leading to more plant-based dinner choices. The message induced cognitive dissonance for those who chose a meat-based lunch, increasing the likelihood of choosing plant-based dinner options. These results indicate that an environmental message can effectively influence meal choices through different mechanisms, offering a cost-effective strategy for practitioners and policymakers to promote environmentally sustainable dining habits in the online meal kit delivery sector.

Challenge your customer: How businesses may trigger change in perceived barriers, capability, and consumption

The global environmental issues require that we redesign food systems. Transitioning towards more plant-based diets is crucial, but there is a gap observed between consumers' intention and behaviour. We propose that businesses in the food sector can play a role by challenging their potential customers to overcome the gap. Drawing on the holistic COM-B model of behaviour change as well as the concept of self-nudging, we conduct an intervention study that shows how a business-driven marketing campaign that mimics challenges in the style of Veganuary could provide an opportunity for change. The mixed methods evaluation reveals that participants significantly reduced meat consumption frequency and maintained this at two months after the challenge. Perceived barriers to eating more plant-based food decreased, while perceived capability to reduce meat consumption increased. Participants talk about health and environment as motives as well as social eating contexts as barriers. We discuss implications for the role of businesses and their marketing activities in the transition to a more sustainable food system.

Factors Impacting Plant-Based Meat Product Consumption: A Consumer Survey Conducted in a New First-Tier City in China

In recent years, the worldwide plant-based meat sector has undergone substantial and rapid expansion. The swift advancement of plant-based meat products in the Chinese market is ascribed to changes in customer dietary preferences. To accelerate the rapid expansion of China's plant-based meat sector, it is essential to conduct research on consumer demand trends. Citespace was utilized in this study to conduct a bibliometric analysis of research pertaining to plant-based meat. A study model was then created to analyze the primary elements affecting the consumption behavior of plant-based meat products. This study employs Zhengzhou as a case study to construct a research model to examine consumers' inclination to purchase plant-based meat products. The model is derived from survey data obtained from 570 consumers. The findings indicate that the characteristics of plant-based meat products significantly influence consumers' purchase intentions and consumption behaviors by shaping their perceptual activity. Price rationality, technical security, and flavor richness are three principal factors influencing customer purchasing of plant-based meat products. The perceived value and trust of consumers can somewhat mediate the influence of plant-based meat consumption behavior. This study offers significant insights into purchasing intentions and consumer behavior in first-tier cities in China. The outcomes of this study can provide a beneficial framework for imitation meat producers to improve product development and stimulate customer interest in the plant-based meat market.

Changing the default meal option at university events to reduce harmful environmental impacts: Six randomized controlled trials

Animal agriculture is a leading contributor to greenhouse gas emissions and other harmful environmental impacts, which underscores the need to shift away from the consumption of animal-based products. One promising nudge intervention is making plant-based meals the default option, so we tested this approach at six different university events across four academic institutions for effecting sustainable dietary change. Event attendees pre-selected their meal on one of two randomly assigned RSVP forms: one with a plant-based default and one with a meal with meat default. The results from our randomized controlled trial showed that participants had a 43-percentage point greater probability of selecting the plant-based meal when it was indicated as the default option. This effect was similar across events and academic institutions, which indicates that this default intervention is generalizable and can be successfully implemented at university events. The combined effect of using plant-based defaults at these six events was an estimated reduction of 104,387 kg of CO2 emissions, 299.9 m2 of land use, 959.0 g of nitrogen use, and 259.5 g of phosphorus use, which represent roughly 45-46.2% reductions in harmful environmental impacts relative to the meals chosen when using a meat default. Given the significance and magnitude of these environmental benefits, our results support the widespread implementation of plant-based defaults for helping universities improve their sustainability.

Identifying segment-specific barriers to ordering environmentally sustainable plant-based meat dishes in restaurants

Eating less meat when dining out can help mitigate climate change. Plant-based meats can facilitate the transition to a more environmentally sustainable tourism sector. However, uptake of these products remains low. Building on the capability-opportunity-motivation behaviour model, this study identifies the main reasons for the general population of restaurant patrons to reject plant-based meats: they prefer meat and traditional vegetable dishes; they are concerned about not enjoying plant-based meat dishes; they perceive plant-based meat dishes as too expensive. Accounting for heterogeneity among diners leads to the identification of six distinct consumer segments, which differ in their reasons for not ordering plant-based meat dishes in restaurants. From these empirical insights, we derive recommendations for tourism professionals on how to entice specific consumer segments to order plant-based meat dishes and identify future avenues for research.

Promoting plant-based eating in meat-centric meal contexts: a field study

OBJECTIVE

Shifting from meat-centric to plant-rich diets may help to enable healthier and more sustainable food systems. Here we present the results of a 1-week intervention to promote plant-based eating in a meat-centric food context (i.e. canteen).

DESIGN

The intervention included environmental restructuring strategies (e.g. promotional materials and menu redevelopment) and improvements to the offer of plant-based meals. The evaluation (sales data; pre-registered) spanned 3 weeks prior to the intervention (baseline), 1 week during the intervention (immediate/short-term impact) and 3 weeks after the intervention (follow-up). Opinion surveys were also used to collect data with customers during the intervention.

SETTING

Canteen unit of a university campus in Portugal (Lisbon metropolitan area).

PARTICIPANTS

In addition to sales data (baseline: 7965 meals; immediate/short-term: 2635 meals; follow-up: 7135 meals), we used opinion surveys to assess customers' meal appraisals during the intervention (n = 370).

RESULTS

The odds of a sold meal being vegetarian were 24 % higher in the intervention week compared with the pre-intervention period [OR = 1·24, 95 % CI (1·10, 1·40)] and 9 % higher in the post-intervention period compared with the pre-intervention period [OR = 1·09, (95 % CI (1·00, 1·19)]. Survey data showed that vegetarian meals compared favourably to meat and fish alternatives in liking, sustainability and satiety.

CONCLUSIONS

A short-term, theory-driven, operationally feasible intervention was effective in promoting increased plant-based meal choices in a collective meal context. Nevertheless, these changes were not entirely sustained over time. Future studies could test whether prolonged or more transformative interventions are necessary to unlock entrenched food practices more effectively in meat-centric collective meal contexts.

How do defaults and framing influence food choice? An intervention aimed at promoting plant-based choice in online menus

Nudging consumers towards plant-based foods by making these choices the default option is a promising strategy for effecting sustainable dietary change. In the hypothetical context of online food ordering in a Northern European country, we examined the underlying mechanisms and effectiveness of swapping the default in menus from meat to a plant-based meat alternative. Results showed that pre-selecting a plant-based option in the online setting was not enough to increase choice of plant-based meals alone. Rather, additionally framing the plant-based default as the more sustainable or tasty option was needed to significantly increase choice. While ease was unimportant and held constant in this online setting, endowment and implied endorsement were found to mediate default success such that the positive influence of endowment outweighed the (surprising) negative effect via endorsement. In contrast to general theoretical expectations of default nudges, an endorsement by an online food provider is unlikely to encourage plant-based choices.

The negative impact of vegetarian and vegan labels: Results from randomized controlled experiments with US consumers

Reducing consumption of animal products is a critically important challenge in efforts to mitigate the climate crisis. Despite this, meals containing animal products are often presented as the default versus more environmentally sustainable vegetarian or vegan options. We tested whether vegetarian and vegan labels on menu items negatively impact the likelihood of US consumers choosing these items by using a between-subjects experimental design, where participants chose a preference between two items. Menu items were presented with titles and descriptions typical at restaurants, and a random group saw "vegan" or "vegetarian" labels in the titles of one of the two items. Two field studies were conducted at a US academic institution, where people selected what to eat via event registration forms. The methodology was extended to an online study, where US consumers selected what to hypothetically eat in a series of choice questions. Overall, results showed the menu items were significantly less likely to be chosen when they were labeled, with much larger effects in the field studies, where choice was not hypothetical. In addition, the online study showed male participants had a significantly higher preference for options containing meat versus other participants. Results did not indicate the impact of labels differed by gender. Furthermore, this study did not find that vegetarians and vegans were more likely to choose items with meat when the labels were removed, indicating that removing labels did not negatively impact them. The results suggest removing vegetarian and vegan labels from menus could help guide US consumers towards reduced consumption of animal products.

Prospects for Plant-Based Meat: Current Standing, Consumer Perceptions, and Shifting Trends

Dietary habits have a substantial influence on both planet and individual health. High intake of animal products has significant negative effects on the environment and on human health; hence, a reduction in meat consumption is necessary. The transition towards plant-based meat (PBM) is one of the potential solutions for environmental and health issues. To achieve this goal, it is important to understand the dietary habits and demands of consumers. This review was designed with a focus on PBM alternatives, dietary shifts during the COVID-19 pandemic, the drivers of consumers' perceptions in various countries, and the measures that can promote the shift towards PBM. The PBM market is predicted to grow with rising awareness, familiarity, and knowledge in the coming years. Companies must focus on the categories of anticipated benefits to aid consumers in making the switch to a diet higher in PBM alternatives if they want to win over the target market.

Social Norms Support the Protein Transition: The Relevance of Social Norms to Explain Increased Acceptance of Alternative Protein Burgers over 5 Years

Developing alternative protein products-based on protein sources other than regular meat-is a possible pathway to counter environmental and health burdens. However, alternative proteins are not always accepted by consumers, and more research is needed to support a shift to more alternative proteins. Prior studies have mainly focused on individual drivers and perceptions; although we expect that social norms-the perceptions of the opinions of relevant others-are highly relevant in accepting alternative proteins. Online surveys were conducted among 2461 respondents in 2015 and 2000 respondents in 2019 (cross-sectional datasets); a subsample (n = 500) responded to both surveys (longitudinal dataset). We add to the literature by (1) demonstrating the added explanatory value of social norms beyond a range of individual drivers; (2) showing that this finding holds over time, and (3) comparing the impact of social norms across different dietary consumer groups. Meat lovers and flexitarians are more prone to follow social norms whereas meat abstainers are more prone to follow their individual attitudes and values. This study highlights the relevance of investigations beyond personal variables such as personal norms and attitudes and underscores the relevance of considering the social aspects of accepting alternative proteins.