PROACTIVE-19 is a pragmatic, randomized controlled clinical trial with adaptive "sample size re-estimation" design. Volunteers will be randomized into two groups: (A) generalized health education; (B) personalized health education. Participants will go through phone questioning and recommendation in 5 fields: (1) mental health (2) smoking habits, (3) physical activity, (4) dietary habits, (5) alcohol consumption. Both groups A and B will receive the same line of questioning to assess habits concerning these topics. In Group A: questioning will be done in sequence followed by a shared minimal intervention aimed towards improvement of these factors but without any personalized recommendation. In Group B: each assessment will be followed by specific and personalized recommendations. Assessment will be done weekly during the first month, every second week in the second month, then monthly. Considering one interim analysis for efficacy the estimated sample size is 3788 (rounded up to 3800) subject per study arm. The planned duration of the follow up is a minimum of one year.
