Inclusion Criteria:  Females (before menopause) and males Age: 20 < 40 years BMI ≥ 18 < 25 kg/m2 Participants must be subjectively healthy Compatibility to one of the four planned groups as confirmed by lifestyle and nutrition-related questionnaires plus food frequency protocol (FFP) over five days Precondition: stable eating habits at least one year before enrollment  Exclusion Criteria:  Subjects with any acute or chronic disease (tumor, infection, other), gastrointestinal diseases, dia-betes mellitus (type I, II), chronic renal disease, diseases of the parathyroid, diseases necessitating regular phlebotomies Intake of additional dietary supplements (e.g. fish oil capsules, vitamins, minerals etc.) Weight loss or weight gain (> 3 kg) during the last three months before study begin Pregnancy or lactation Transfusion of blood in the last three months before blood sample taking