Nutritional Evaluation - NuEva Study

Inclusion Criteria: * BMI \< 30 kg/m2 * Participants must be subjectively healthy * Adherence to one of the four groups (Western diet, flexitarians, vegetarians, vegans) confirmed by lifestyle and nutrition questionnaires, food frequency protocol (7 d) * Precondition: stable eating habits for at least two years before enrollment Exclusion Criteria: * Subjects with any acute or chronic disease (tumor, infection, other), gastrointestinal diseases, diabetes mellitus (type I, II), chronic renal disease, diseases of the parathyroids, 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