AI-generated food images look tastier than real ones

With the Global Nutrition and Hydration Week 2024 starting today, researchers have announced an intriguing discovery – consumers generally prefer AI-generated images of food over real food images, especially when they are unaware of their true nature. The new findings have been published in Food Quality and Preference.

According to the researchers, the results suggest that AI-generated food visuals excel at enhancing the appeal of depicted foods by leveraging key features such as symmetry, shape, glossiness, and overall lighting and colour. All of these are known to contribute significantly to the attractiveness of food imagery.

Even subtle tweaks in positioning may enhance the appeal of AI-generated food images. Lead author Giovanbattista Califano (Department of Agricultural Sciences, University of Naples Federico II) explained: ‘As humans, we tend to feel uneasy with objects pointing towards us, interpreting them as threats, even when it’s just food. When tasked with replicating food photos featuring items pointing at the viewer, such as a bunch of carrots or a piece of cake, the AI often positions the food so that it doesn’t directly point at the viewer. This warrants further studies, but it's plausible that this approach enhances the perceived attractiveness of the depicted food.’

In the study, the researchers asked 297 participants to rate real or AI-generated food images on a scale from “Not at all appetizing” to “Extremely appetizing.” The images depicted a range of natural, processed, and ultra-processed foods, from apples and carrots to chocolate milkshakes and potato fries. When participants were told how each image had been created—whether through photography or AI—they tended to rate real and AI-generated versions equally appealing. However, when participants were unaware of the image creation process, the AI-generated version was consistently rated as significantly more appetizing than the real food image.

Study supervisor and co-author Professor Charles Spence (Department of Experimental Psychology, University of Oxford) said: ‘While AI-generated visuals may offer cost-saving opportunities for marketers and the industry by reducing the cost of commissioning food photoshoots, these findings highlight potential risks associated with exacerbating ‘visual hunger’ amongst consumers—the phenomenon where viewing images of food triggers appetite and cravings. This could potentially influence unhealthy eating behaviours or foster unrealistic expectations about food among consumers.’

Additionally, the researchers also found that AI-generated images tend to depict foods to appear more energy-dense compared to the originals, particularly in the abundance portrayed. For instance, AI may increase the number of fries in the image or add more whipped cream to a dessert. Given that humans have an evolutionary drive to pay more attention to energy-dense foods, this raises concerns that widespread dissemination of such idealized food images could promote cue-induced eating of unhealthy foods.

Furthermore, with the global movement towards more sustainable consumption patterns, including the promotion of ‘ugly’ fruits and vegetables, there is a concern that constant production of AI-enhanced food images might nudge consumers towards an unrealistic standard of how natural foods should look, potentially harming sustainability efforts.

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This article, “Assessing the visual appeal of real/AI-generated food images”, by Giovanbattista Califano and Charles Spence, has been published online in Food Quality and Preference: https://doi.org/10.1016/j.foodqual.2024.105149

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For media enquiries and interview requests contact:

Giovanbattista Califano (giovanbattista.califano@unina.it)

Charles Spence (charles.spence@psy.ox.ac.uk)

Images

All images used in the study are accessible in Appendix A. Supplementary data through the following link: https://doi.org/10.1016/j.foodqual.2024.105149

About the University of Naples Federico II (www.unina.it)

The University of Naples Federico II is a public research university in Naples, Campania, Italy. Established in 1224 and named after its founder, Frederick II, it is the oldest public, secular, non-sectarian or state-funded university in the world, and one of the world’s ten oldest universities in continuous operation.

In 2024, the University of Naples Federico II proudly celebrates its 800^th anniversary, marking eight centuries of academic excellence, innovation, and cultural impact. With over 90,000 students in 2022 it is among the largest universities in Europe.

Among those who have attended the University of Naples Federico II are Italian presidents Enrico De Nicola, Giovanni Leone and Giorgio Napolitano; philosophers Giordano Bruno, Benedetto Croce and Nicola Abbagnano; astronaut and commander of the International Space Station Samantha Cristoforetti.

About the University of Oxford (www.ox.ac.uk)

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