Assessing Mediterranean Diet Adherence with the Smartphone: The Medipiatto Project

Vasiloglou, Maria F.; Lu, Ya; Stathopoulou, Thomai; Papathanail, Ioannis; Faeh, David; Ghosh, Arindam; Baumann, Manuel; Mougiakakou, Stavroula (2020). Assessing Mediterranean Diet Adherence with the Smartphone: The Medipiatto Project. Nutrients, 12(12) MDPI 10.3390/nu12123763

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The Mediterranean diet (MD) is regarded as a healthy eating pattern with beneficial effects both for the decrease of the risk for non-communicable diseases and also for body weight reduction. In the current manuscript, we propose an automated smartphone application which monitors and evaluates the user's adherence to MD using images of the food and drinks that they consume. We define a set of rules for automatic adherence estimation, which focuses on the main MD food groups. We use a combination of a convolutional neural network (CNN) and a graph convolutional network to detect the types of foods and quantities from the users' food images and the defined set of rules to evaluate the adherence to MD. Our experiments show that our system outperforms a basic CNN in terms of recognizing food items and estimating quantity and yields comparable results as experienced dietitians when it comes to overall MD adherence estimation. As the system is novel, these results are promising; however, there is room for improvement of the accuracy by gathering and training with more data and certain refinements can be performed such as re-defining the set of rules to also be able to be used for sub-groups of MD (e.g., vegetarian type of MD).

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