Malnutrition is a societal challenge affecting in particular a large group of frail seniors. Current initiatives to support frail seniors in improving their dietary habits have so far not produced any lasting results. The project MyFoodCoach aims to support frail seniors and improve their dietary habits with lasting results. A social robot which builds on serious gaming techniques will be developed to inform, motivate and challenge seniors in improving their diet. The robot will collaborate with the professional caregiver and with the social network of the senior.