Inclusion Criteria:  Stable inpatients from the Department of heart surgery, or Center for senior trauma patient at the university hospital Zurich (inpatient group) Ambulatory volunteers who can visit the center for aging and mobility (CAM) independently ("outpatients" group) ≥50 years  Exclusion Criteria:  If already involved in another ongoing interventional clinical trial, except an interaction with this intervention can be excluded People with an impaired short-term memory (MMSE <24) Patients following a specific diet recommended by a medical professional, due to diseases such as diabetes, chronic diseases of the gastrointestinal tract, severe kidney disease, or patients allergic to the main components of the Mediterranean diet/MINDdiet (olive oil, nuts) Outpatients: HbA1C ≥6.5% Inpatients: HbA1C ≥6.5% or diagnosed diabetes mellitus if HbA1C is not available in KISIM BMI > 30 kg/m2 Individuals per se not willing to change diet Instable clinical conditions (e.g. acute infection) at enrolment Patients with active cancer (except non-melanoma skin cancer) or current cancer treatment or any other advanced severe disease Living in a nursing home and/or receiving prepared meals (i.e. usually not eating home cooked meals) Inability to read and or speak German necessary to understand the instructions