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Influence des normes sociales sur les choix et changements de comportements alimentaires vers des régimes de meilleure qualité nutritionnelle

Abstract : Strategies based on social norms are considered to promote healthy eating practices and reduce the growth of overweight and obesity. Social modeling involves using behavior of those around us as a norm to refer to for our own behavior. While this phenomenon has been widely studied regarding portion sizes only a small number of studies have investigated its influence on food choices, even less during meals and in real-life conditions. The aim of this thesis was to characterize the social modeling of choices during meals, particularly in real-life conditions, and to assess the potential effects of social norms on changes in eating behavior. First, an observational study allows to observe social modeling of choices in a university canteen, specifically for starters, and those of better nutritional quality. A study under controlled conditions was then carried out in order to validate the specificities observed during the first study. This study did not allow to observe any social modeling of food choices, however it highlighted significant moderating effects, such as food preferences. Finally, a third study conducted online was based on dietary changes that took place during the first lockdown linked to covid-19 in France, and aimed to understand how social norms could drive changes in food habits, and whether such changes could be persistent. This study showed that the perception of changes in food habits of the relatives, but not those of the general population, was significantly correlated with the changes established by individuals. Moreover, participants whose household relatives made changes to their food habits were more likely to maintain their own changes over time. Overall, these results indicate that social modeling is a phenomenon that influences our daily meal choices, but which is moderated by factors such as food preferences and food categories but also self-identification and social link with the issuer of the norm. Finally, these results suggest that the implementation of interventions based on the social norms approach could be interesting to sustainably improve food habits of the population.
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Submitted on : Wednesday, March 30, 2022 - 2:16:08 PM
Last modification on : Friday, August 5, 2022 - 2:41:28 PM


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Armelle Garcia. Influence des normes sociales sur les choix et changements de comportements alimentaires vers des régimes de meilleure qualité nutritionnelle. Alimentation et Nutrition. Université Paris-Saclay, 2021. Français. ⟨NNT : 2021UPASB050⟩. ⟨tel-03624692⟩



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