Modeling the acceptance of vegetarian diets to promote sustainable food systems.

With increasing concerns about health, animal welfare, and the environment, changes in dietary patterns are emerging, as evidenced by the gradual shift toward plant-rich diets. To appropriately plan vegetarian meals with high consumer satisfaction that would help promote this dietary pattern and ultimately improve the sustainability of food systems, meal acceptability testing would be crucial. The present work aims to investigate the influence of individual food components' acceptability on the overall meal acceptability in vegetarian diets. Over four taste-testing periods, 94 panelists of US nationality recruited from Cornell University staff (47 males and 47 females; 30-50 years of age) were asked to rate the acceptability of 41 vegetarian meals containing various food category items, including a main dish, side dish, appetizer, salad, soup, bread, dessert, beverage, and a control food. Each meal included six menu items to ensure the tested foods resembled a typical meal. Consequently, some meals lacked one or more of the nine total food categories. Participants were asked to rate the acceptability of the six meal items and the overall meal acceptability on a 9-point hedonic scale. Multiple imputation was used to fill in any missing data, and multiple linear regression analysis was then performed. Through this study, a model that predicts the overall meal acceptability of vegetarian diets based on individual meal category components was developed with an -squared value of .7033, suggesting that around 70.33% of the variation in overall meal acceptability could be explained by the nine food category predictors. The findings also suggested that the most influential food item on overall meal acceptability was the main dish followed by the side dish. For every unit increase in the acceptability score of the main dish on a 9-point hedonic scale, the overall meal acceptability increased by 0.324 points. The positive findings would be beneficial to food service providers in designing a vegetarian meal with high meal acceptability. By focusing on optimizing the acceptability of these two key categories, menu planners can effectively elevate customers' satisfaction of their meals.