I. Introduction
The EU-funded project WellCo [1] is aimed to deliver a mobile application with a virtual coach that encourages the elderly users towards a healthier lifestyle, by monitoring their physical, cognitive, mental and social habits and provide recommendations in order to improve their well-being. Nutrition module is just one of the modules included in the application, as proper dietary habits are very important for healthy lifestyle and help to prevent many chronic diseases (diabetes, hypertension etc.).