The main study objective is to determine the feasibility and impact (effectiveness) of intervention models for lifestyle changing (diet and physical activity) on health outcomes. Women 50 to 54-year-old attending the local breast cancer screening and 58-year-old people (both sexes) undergoing colorectal cancer screening are invited to participate in the study. Compliers are randomized into 3 intervention groups (Diet, Physical Activity, and Physical Activity and Diet) and into the 'usual care' Control group. Biological sampling (blood and saliva) is collected from all participants. All participants undergo also anthropometric measurements and fill in a self-administered validated questionnaire on their dietary and physical activity habits. All enrolled subjects receive a booklet with basic information about diet and physical activity. Subjects randomized to the 3 intervention groups are also offered one theoretical and three training courses. The courses are specifically designed for the different interventions proposed and aimed at reinforcing the educational counseling and at supporting behavioral changes.