There is overwhelming evidence of patients' low compliance with taking medication and keeping health related diets. In this work, we explore Visual, Interactive, and Personalized-content (VIP) feedback, as a novel method for increasing a patient's compliance with health care prescriptions. We hypothesize that VIP feedback positively affects intentions to change health behavior by affecting the users' sense of involvement, self-efficacy and comprehension, and, thereby, affecting their intentions to change behavior. We then test the mediation model through a longitudinal experiment in which the subjects used a nutritional information system that supplied them with personal medical information (n=155). The results support the mediation model and present interesting implications for design. VIP feedback offers an opportunity to develop longterm intervention effects on users' behavior.