 La Laguna, Tenerife, Spain where the study was conducted in its second year. was divided into two phases, each containing a control and an experimental group in each setting. The PROVITAO project is an important example of the quantified self (QS) proposal. QS is increasingly being used for healthcare with new methods and biometric data analysis. The QS application has many advantages: self-healing, self- discipline, self-improvement, self-knowledge, and SO forth. Using this technique, both the healthcare provider and their subject can update information on a measure such as anthropometric data, socioeconomic data, activity data, personal characteristics, diet data, blood test, medical reports, and the like, and this data can be collected and monitored. This is achieved through the use of wearables, mobile phones, apps, activity logs, and exploration. In the first phase the information collected by the med- ical practitioners in the hospital was given to the research team along with the infor- mation relating to the technology network used at home and collected by caregivers. In the second phase, physical education teachers in the participating schools were asked to record information regarding age, weight, height, and sex. There have been serious games and applications developed for educational intervention to promote healthy living. Low-cost heart rate monitors and accelerometers were used to collect the data throughout the study. The PROVITAO app for smartphones and tablets, as well as a portal to gamify the activities accomplished by the children, was developed, and utilized for intervention, with weekly tasks that earned points, rewards, and SO on. The results showed no significant improvement in physical activity between the control and experimental group but there was a significant increase related to the knowledge about healthy eating after using it for the long term. The intervention had a positive impact on the emotional development of the children. The application also collected and monitored importan