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Providing food choices during a meal : Impact on food liking and food intake

Abstract : Out-of-home catering services frequently offer consumers the opportunity to choose their foods from among different proposals and/or provide consumers with a variety of food. The present thesis aimed at investigating the effect of providing choice of equally-liked foods during a meal on food liking and food intake in healthy, normal-weight adults. The first part focused on two characteristics of a food product assortment (desserts) as modulator factors of the choice effect: (i) the degree of similarities between desserts and (ii) the level of pleasantness of desserts. Two independent behavioral studies using the same paradigm were carried out in adults (n=80 for each experiment) who participated in a choice and a no-choice session. Providing choice enhanced food liking no matter the degree of similarity between the desserts, but enhanced food intake only when products were sufficiently dissimilar. The choice effect on food liking and food intake was not modulated by the level of pleasantness of alternatives. The second part of the thesis assessed the impact of choice and/or variety on food liking and food intake. Fifty-nine adults participated in a 4-session study where they consumed vegetable dishes under the four following conditions: (i) being served one dish (no-choice/no-variety); (ii) being served the three dishes (no-choice/variety); (iii) choosing one dish from among three (choice/no-variety) and (iv) choosing as many dishes as wanted (choice/variety). Providing choice increased vegetable liking and vegetable intake, while offering a variety of vegetables only increased their liking. No synergy effect between choice and variety was observed on vegetable liking and vegetable intake (i.e. the effect in the choice/variety condition was not significantly higher than the effects in the no-choice/variety and choice/no-variety conditions). It may be then concluded that providing choice of food to adults increases food liking even when choice is made among similarly-liked foods. Regarding choice and variety effects, however, their impacts on food intake appear to be vulnerable to contextual factors, and especially, the degree of similarity between food options.
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Odile Parizel. Providing food choices during a meal : Impact on food liking and food intake. Food and Nutrition. AgroParisTech, 2016. English. ⟨NNT : 2016AGPT0067⟩. ⟨tel-03001071⟩

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