[EN]At present, obesity and overweight are a global health epidemic. Traditional interventions
for promoting healthy habits do not appear to be e ective. However, emerging technological solutions
based on wearables and mobile devices can be useful in promoting healthy habits. These applications
generate a considerable amount of tracked activity data. Consequently, our approach is based on
the quantified-self model for recommending healthy activities. Gamification can also be used as
a mechanism to enhance personalization, increasing user motivation. This paper describes the
quantified-self model and its data sources, the activity recommender system, and the PROVITAO
App user experience model. Furthermore, it presents the results of a gamified program applied for
three years in children with obesity and the process of evaluating the quantified-self model with
experts. Positive outcomes were obtained in children’s medical parameters and health habits.
