Inclusion Criteria:  Overweight or obesity (BMI between 25 and 35 kg/m2) Low score in the screening questionaire "Homecooking Quality Index" (HQI)  Exclusion Criteria:  Pregnant or lactating women. Serious medical condition precluding dietary intervention or limiting survival to less than one year. Illicit drug use, chronic alcoholism. Participation in any clinical trial with drugs or dietary intervention during the year prior to inclusion. Weight loss intervention (surgical treatment, dietary or pharmacological treatment) during the last year Difficulty or major drawbacks to change dietary habits and follow Mediterranean diet (allergies, intolerances).