The Impact of Both Individual and Contextual Factors on the Acceptance of Personalized Dietary Advice

(1) Background: The aim of the current study is to investigate which between-and within-person factors influence the acceptance of personalized dietary advice. (2) Methods: A repeated measurements design was used in which 343 participants (M (SD) age = 48 (17.3), 49% female) filled out a baseline survey and started with nine repeated surveys. (3) Results: The results show that the acceptance of personalized dietary advice is influenced by both within-person and between-person factors. The acceptance is higher at lunch compared to breakfast and dinner, higher at home than out of home, higher at moments when individuals have a high intention to eat healthily, find weight control an important food choice motive and have a high healthy-eating self-efficacy. Moreover, the acceptance is higher when individuals do not see the eating context as a barrier and when individuals believe that personalized dietary advice has more benefits than risks. (4) Conclusions: Future behavioral interventions that use personalized dietary advice should consider the context as well as individual differences

Determinants of real-life behavioural interventions to stimulate more plant-based and less animal-based diets: A systematic review

Background: Facilitating a transition to more plant-based and less animal-based diets would strongly alleviate the environmental impact of food, while plant-based diets can also decrease the health risks of excess meat consumption. So far, little is known about which underlying determinants can most effectively steer consumers to more healthy and/or sustainable food consumption. Gaining more knowledge about underlying determinants gives more insight into why certain interventions are effective or not in promoting healthy and/or sustainable food consumption among consumers. Scope and approach: In this systematic review real-life behavioural interventions are investigated that aim to promote more plant-based and/or less animal-based food consumption among consumers. The review focuses specifically on the interventions’ targeted determinants. In total, 48 articles (51 studies) are included in this review. Key findings and conclusions: The findings indicate that targeting individual determinants (such as increasing consumers’ level of self-regulation) or environmental determinants (such as modifying portion sizes) is relatively effective to promote more plant-based and less animal-based food consumption. Almost all included studies that aimed to increase plant-based food consumption focus on fruit and vegetables. This implies a need for future real-life intervention studies to focus on plant-based food consumption other than fruit and vegetables, such as legumes or whole grains. Also, relatively few real-life intervention studies have been conducted that focus on a decrease in animal-based food consumption, either separately or in combination with increasing plant-based food consumption. This review is registered with PROSPERO - CRD42019125314.</p

Motive-based consumer segments and their fruit and vegetable consumption in several contexts

A targeted approach to increase fruit and vegetable consumption, considering the heterogeneity of food choice motives across consumers and across contexts, is expected to be more effective than the often used ‘one-size-fits-all approach’. Therefore, the current study aims to increase understanding of consumers’ food choice motives across contexts, to identify consumer segments based on these motives and to gain insights in fruit and vegetable consumption, perceptions and demographic characteristics of these segments. An online survey was conducted in May 2015 among consumers in the Netherlands, Germany, France, the United Kingdom, Poland, Spain, Greece, Croatia and Serbia. 3064 participants completed the survey on fruit and 2998 participants completed the survey on vegetables. Four segments were identified, differing in their focus on present versus future food choice motives for main meals at home and for other contexts. The segments differed in their consumption, perceptions of fruit and vegetables and in their demographic characteristics. Implications for targeted approaches to increase fruit and vegetable consumption are discussed.</p

Consumer acceptance of personalised nutrition : The role of ambivalent feelings and eating context

Providing dietary suggestions based on an individual's nutritional needs may contribute to the prevention of non-communicable dietary related diseases. Consumer acceptance is crucial for the success of these personalised nutrition services. The current study aims to build on previous studies by exploring whether ambivalent feelings and contextual factors could help to further explain consumers' usage intentions regarding personalised nutrition services. An online administered survey was conducted in December 2016 with a final sample of 797 participants in the Netherlands. Different models were tested and compared by means of structural equation modelling. The final model indicated that the result of weighing personalisation benefits and privacy risks (called the risk-benefit calculus) is positively related to the intention to use personalised nutrition advice, suggesting a more positive intention when more benefits than risks are perceived. Additionally, the model suggests that more ambivalent feelings are related to a lower intention to use personalised nutrition advice. Finally, we found that the more the eating context is perceived as a barrier to use personalised nutrition advice, the more ambivalent feelings are perceived. In conclusion, the current study suggests the additional value of ambivalent feelings as an affective construct, and eating context as a possible barrier in predicting consumers' intention to use personalised nutrition advice. This implies that personalised nutrition services may need to address affective concerns and consider an individual's eating context.</p

Consumer acceptance of personalised nutrition : The role of ambivalent feelings and eating context

Providing dietary suggestions based on an individual's nutritional needs may contribute to the prevention of non-communicable dietary related diseases. Consumer acceptance is crucial for the success of these personalised nutrition services. The current study aims to build on previous studies by exploring whether ambivalent feelings and contextual factors could help to further explain consumers' usage intentions regarding personalised nutrition services. An online administered survey was conducted in December 2016 with a final sample of 797 participants in the Netherlands. Different models were tested and compared by means of structural equation modelling. The final model indicated that the result of weighing personalisation benefits and privacy risks (called the risk-benefit calculus) is positively related to the intention to use personalised nutrition advice, suggesting a more positive intention when more benefits than risks are perceived. Additionally, the model suggests that more ambivalent feelings are related to a lower intention to use personalised nutrition advice. Finally, we found that the more the eating context is perceived as a barrier to use personalised nutrition advice, the more ambivalent feelings are perceived. In conclusion, the current study suggests the additional value of ambivalent feelings as an affective construct, and eating context as a possible barrier in predicting consumers' intention to use personalised nutrition advice. This implies that personalised nutrition services may need to address affective concerns and consider an individual's eating context.</p

Sustainable food choice motives : The development and cross-country validation of the Sustainable Food Choice Questionnaire (SUS-FCQ)

In view of all kinds of sustainability concerns related to our current diet, it is essential to gain a good understanding of the sustainability motives consumers have for selecting their food. A comprehensive and validated scale to measure sustainability motives within the full range of food choice motives could contribute to this understanding, especially as sustainability is a multi-faceted concept in which the different aspects can sometimes be conflicting. The current paper aims to 1) develop the Sustainable Food Choice Questionnaire (SUS-FCQ) that covers the full concept of sustainability, 2) test which dimensions of sustainable food choice motives can be distinguished and 3) validate the scale as part of the Food Choice Questionnaire in multiple countries. An online survey was completed by 5,116 respondents from five European countries (The Netherlands, Denmark, Czech Republic, France and Italy). The scale was developed with a Dutch sub-sample and validated in all included countries. Exploratory factor analysis followed by confirmatory factor analyses resulted in a two-factor solution. A ‘general sustainability’ dimension (6 items, covering environmental, ethical and animal welfare aspects) and a ‘local & seasonal’ dimension (3 items) were identified. The Sustainable Food Choice Questionnaire shows to be reliable and valid in the five included countries and can be used as an addition to the Food Choice Questionnaire developed by Steptoe and colleagues (1995). The scale is suitable to gain a better understanding of the position of sustainability motives against other motives in consumers food choices and can be used for country comparisons.</p

Determinants of consumer acceptance and use of personalized dietary advice : A systematic review

Background: There has been growing attention towards personalizing dietary advice to the specific lifestyle, phenotypic and genotypic properties of consumers. Consumer acceptance and advice adherence is critical for the success of services offering personalized dietary advice. However, more insight is needed in the current body of knowledge on the determinants of consumer acceptance and use of personalized dietary advice. Scope and approach: This literature review provides an overview of the current knowledge on consumer acceptance, use and effectiveness of personalized dietary advice based on the four information flow stages in personalized dietary advice: (1) information provision from consumer to formulate a personalized dietary advice, (2) personalized advice generation, (3) advice provision to the consumer, (4) advice acceptance and adherence. Key Findings and Conclusions: Results show that the extent to which each step in the cycle is considered in the reviewed studies varies strongly, with most emphasis on the advice adherence, such as changes in dietary intake. In contrast, it is less clear how consumer data is used to generate a personalized dietary advice. Based on the studies in our review, we identify aspects that play a role in the consumer acceptance of personalized dietary advice and the best design practices for creating a successful personalized advice

Beneficial effect of personalized lifestyle advice compared to generic advice on wellbeing among Dutch seniors – An explorative study

The aim of this explorative study is to evaluate whether personalized compared to generic lifestyle advice improves wellbeing in a senior population. We conducted a nine-week single-blind randomized controlled trial including 59 participants (age 67.7 ± 4.8 years) from Wageningen and its surrounding areas in the Netherlands. Three times during the intervention period, participants received either personalized advice (PA), or generic advice (GA) to improve lifestyle behavior. Personalization was based on metabolic health measures and dietary intake resulting in an advice that highlighted food groups and physical activity types for which behavior change was most urgent. Before and after the intervention period self-perceived health was evaluated as parameter of wellbeing using a self-perceived health score (single-item) and two questionnaires (Vita-16 and Short Form-12). Additionally, anthropometry and physical functioning (short physical performance battery, SPPB) were assessed. Overall scores for self-perceived health did not change over time in any group. Resilience and motivation (Vita-16) slightly improved only in the PA group, whilst mental health (SF-12) and energy (Vita-16) showed slight improvement only in the GA group. SPPB scores improved over time in both the PA and GA group. PA participants also showed a reduction in body fat percentage and hip circumference, whereas these parameters increased in the GA group Our findings suggest that although no clear effects on wellbeing were found, still, at least on the short term, personalized advice may evoke health benefits in a population of seniors as compared to generic advice.</p

Beneficial effect of personalized lifestyle advice compared to generic advice on wellbeing among Dutch seniors – An explorative study

The aim of this explorative study is to evaluate whether personalized compared to generic lifestyle advice improves wellbeing in a senior population. We conducted a nine-week single-blind randomized controlled trial including 59 participants (age 67.7 ± 4.8 years) from Wageningen and its surrounding areas in the Netherlands. Three times during the intervention period, participants received either personalized advice (PA), or generic advice (GA) to improve lifestyle behavior. Personalization was based on metabolic health measures and dietary intake resulting in an advice that highlighted food groups and physical activity types for which behavior change was most urgent. Before and after the intervention period self-perceived health was evaluated as parameter of wellbeing using a self-perceived health score (single-item) and two questionnaires (Vita-16 and Short Form-12). Additionally, anthropometry and physical functioning (short physical performance battery, SPPB) were assessed. Overall scores for self-perceived health did not change over time in any group. Resilience and motivation (Vita-16) slightly improved only in the PA group, whilst mental health (SF-12) and energy (Vita-16) showed slight improvement only in the GA group. SPPB scores improved over time in both the PA and GA group. PA participants also showed a reduction in body fat percentage and hip circumference, whereas these parameters increased in the GA group Our findings suggest that although no clear effects on wellbeing were found, still, at least on the short term, personalized advice may evoke health benefits in a population of seniors as compared to generic advice.</p