Lifestyle Intervention Among Participants of the French Colorectal Cancer Screening Program (LIFE-SCREEN)

Inclusion Criteria: * Having read the information note and agreeing to participate * Will and availability to be committed for a full year * At high risk for CRC but CRC negative * Affiliated to a health security system * Having a score on the adherence to the recommendation lower than or equal to 7 out of 9 at baseline. * Able to read, write and understand French Exclusion Criteria: * Under a strict diet such as meal replacements, diets for co-morbidities such as diabetes * Immobile due to physical constraints (e.g. handicap that is not compatible with physical activities) * Extensive intestinal surgery such as colectomy or surgical resection of the colon * Chronic gastrointestinal illness (IBD, IBS, celiac disease) * Colorectal cancer confirmed or history of a primary cancer * Severe malnutrition * Pregnant * Participation in another lifestyle study NB : For this study, there is no exclusion period from other research, and participants can simultaneously take part in another study unless it concerns lifestyle.