Predicting Food Waste Avoidance: Analysis of an Extended Model of the Theory of Planned Behavior and of Relevant Beliefs.

This research adopted the Theory of Planned Behavior (TPB) to predict intention and behavior to avoid food waste. In a pilot study, behavioral, normative, and control beliefs were identified. In the main study, a TPB model extended with descriptive and moral norms was assessed using a two-wave design and applying SEM. The associations between beliefs and TPB constructs were analyzed by MIMIC models. Attitude, descriptive and moral norms, and perceived behavioral control were associated with intention to avoid food waste, which predicted behavior. Considering the most important beliefs in forming intentions has important implications for designing food waste prevention interventions.

Italian validation of a short version of the Dutch eating behavior questionnaire: Psychometric properties and relationships with self-esteem, eating self-efficacy, and snacking habits in university students.

Background: The Dutch Eating Behavior Questionnaire (DEBQ) is a widely used self-report measure of eating styles, i.e., emotional, restrained, and external. A short and reliable version is useful for screening, routine assessments, and multipurpose surveys. Objective: The short version of the DEBQ by Bailly et al. (2012) was validated in the Italian context in two studies. Concurrent criterion validity was tested by considering gender, body mass index, self-esteem, eating self-efficacy, and snacking habits. Method: Data were collected via online questionnaires administered to two convenience samples of university students (n = 613, n = 856). Results: The three-factor structure of the short version of the DEBQ was supported and was invariant across genders. Correlations among the three eating styles, gender, body mass index, self-esteem, eating self-efficacy, and snacking habits followed the expected pattern. Conclusion: The short form of the DEBQ is psychometrically sound and can be used to investigate eating styles among Italian university students.

Integrating the theory of planned behavior and the self-determination theory to promote Mediterranean diet adherence: A randomized controlled trial.

The Mediterranean diet (MD) is one of the healthiest and most sustainable food regimes. Nevertheless, MD diffusion is still limited, emphasizing the need to understand the psychosocial factors that could predict and promote its adoption. Starting from an integrated model of Theory of Planned Behavior (TPB) and Self-Determination Theory (SDT), the present randomized controlled trial investigated the effect of manipulating motivation (autonomous vs. controlled) on intention and MD adherence behavior. Participants included 726 Italian adults randomly allocated to one of three conditions: autonomous motivation manipulation, controlled motivation manipulation, and control group. TPB variables were measured immediately after manipulation (T1), while MD adherence was evaluated 2 weeks later (T2). Results from multivariate analyses of variance highlighted that participants in the autonomous motivation condition reported higher intention and a more favorable cognitive attitude than control group participants. However, no change in behavior was found. Moreover, a path analysis with mediation effect showed that the impact of autonomous motivation condition versus control group on intention was mediated by cognitive attitude. Findings support the integration of TPB and SDT to encourage intention to adhere to the MD, also suggesting that prompting autonomous motivation may help to promote a greater diffusion of this healthy and sustainable dietary pattern.

Organizational Work-Home Culture and its Relations with the Work-Family Interface and Employees' Subjective Well-being.

The two studies reported in this paper aimed to present and discuss both the validation of the Work-Home Culture (WHC) scale (Dikkers et al., Work & Stress, 21(2), 155-172, 2007) in the Italian context (Study 1), and a relational model that links the WHC to subjective well-being via the mediation of three facets of the work-home interface: work-family conflict, work-family enrichment and work-family balance (Study 2). Heterogeneous samples of workers from different organisations took part in the cross-sectional studies. Substantial support was provided for the robustness of the factorial structure of the 18-item WHC scale with five factors (three support dimensions and two hindrance dimensions). Individuals' perceptions of a supportive WHC that characterises the organisation they work for - particularly with respect to work-family issues and the use of family-friendly benefits - turned out to be positively associated with work-family enrichment and balance. Only organisational time demands, which is a hindrance dimension, was associated with work-family conflict. Moreover, our findings suggest that WHC is significantly associated with subjective well-being and that this association is largely indirect - through the facets of work-family interface - rather than direct. The results of the two studies represent a relevant achievement from the perspective of conducting future research using this measure in different socio-cultural environments and ad hoc interventions in the fields of organisational psychology and occupational health.

Buying Organic Food Products: The Role of Trust in the Theory of Planned Behavior.

When someone decides to buy organic food products trust plays a role. Consumers, in fact, are neither supposed to have the appropriate knowledge to evaluate the characteristics of these products, nor can they control that the food was actually manufactured following the procedures prescribed by organic production. Therefore, trust may contribute to the explanation of both purchasing intention and behavior since it represents a heuristic or shortcut that people adopt in order to reduce the large amount of information that consumers need to take into account. The present research aimed to analyze the role of trust in organic products on buying behavior adopting the Theory of Planned Behavior (TPB) as theoretical framework. A relational model was tested in which this variable was supposed to act as a background factor associated with all the classical constructs foreseen by the theory and the buying behavior. Also, indirect effects of trust on both intention and behavior were assessed. Two studies were conducted targeting the purchase of organic food products in general (Study 1) and of fresh organic fruit and vegetables (Study 2). In both studies, the data collection was organized in two waves, with a time lag of 1 month. At Time 1, the questionnaires included measures of intention, its antecedents and trust, while at Time 2 self-reported buying behavior was collected. Data were supplied by two convenience samples of Italian adults (237 and 227 participants) and analyzed via structural equation modeling. Results turned out to be overlapping in both studies, since trust was positively associated with attitude and subjective norm, and it was indirectly associated with intention and behavior, thanks to the mediation of the TPB constructs. The outcomes highlighted the importance of people's trust in organic products as a meaningful antecedent that boosts the TPB-based psychosocial processes that are supposed to stand behind both purchasing intentions and behaviors.

Energy-Saving Behaviours in Workplaces: Application of an Extended Model of the Theory of Planned Behaviour.

Individual energy-saving behaviours are crucial for reducing energy consumption, and research on the determinants of these behaviours has been increasing over the last decade. The aim of this study is to explore the determinants of two specific behaviours: 'switching off non-essential lights' and 'completely switching off electronic devices'. An extended model of the theory of planned behaviour (TPB) has been used as the theoretical research framework. The extension was implemented by considering two components (affective and cognitive) of the attitude towards these behaviours and then adding habit as a new variable. A two-waves study was conducted in which a convenience sample of Italian workers completed a questionnaire measuring the TPB constructs in relation to the two energy-saving behaviours (Time 1). The participants then completed another questionnaire a month later to assess self-reports of these behaviours (Time 2). The inclusion of habit improved the predictive power of the TPB, and the extended model was found to explain 65.5% and 76.1% of the variance in intentions and 16.2% and 22.9% of the variance in behaviours. Cognitive attitude, subjective norm, perceived behavioural control, and habit were significantly related to intentions, and perceived behavioural control was the strongest predictor. Habit moderated some relationships between the TPB constructs and intentions. Behaviours were associated directly only with intentions. The results of this study support the efficacy of the TPB model in predicting target behaviours; they also suggest some strategies that can be followed to promote these energy-saving behaviours.

Predicting fruit consumption: A multi-group application of the Theory of Planned Behavior.

The main aim of the study was to test a two-wave longitudinal prediction model for the consumption of at least three portions of fruit per day, that was grounded on the Theory of Planned Behavior (TPB; Ajzen, 1991), extended with measures of past behavior and self-identity as a healthy eater. Self-identity is defined as a salient part of the self-concept specifically relates to a desirable behavior, such as, in this case, healthy eating. A second aim of the study was to test the invariance of the proposed model in two samples of Italian university students (n = 208) and no-student adults (n = 321). At time 1 the questionnaire was made up of measures of TPB constructs, with the addition of past consumption and self-identity as a healthy eater. Both the affective and evaluative components of attitude were assessed. At time 2, only the target behavior was surveyed. After checking both adequacy of the measurement model and reliability estimates, data were analyzed via structural equation modelling that returned good fit indices. Results showed that intention was positively associated with subjective norm, perceived behavioral control, self-identity and past behavior. Altogether, they explained 78% of the intention variance in the student group, and 81% in the adult group. After controlling for intention, past behavior - but not self-identity - was significantly related to the self-reported behavior, and the model explained 69% and 62% of behavior variance, respectively. Multi-sample analysis supported model invariance across the two groups. Results and their possible applications are presented and discussed.