Inclusion Criteria:  BMI: 27 - 34,9 kg/m2 Waist circumference: women ≥ 80 cm, men ≥ 94 cm At least two of the following criteria of metabolic syndrome:  Fasting triglycerides in serum: ≥ 150 mg/dl Fasting HDL-Cholesterol in serum: women < 50 mg/dl, men < 40 mg/dl Systolic blood pressure: ≥ 130 mmHg, diastolic blood pressure: ≥ 85 mmHg Fasting glucose in plasma: ≥ 100 mg/dL  Exclusion Criteria:  Smoking Diseases that may impact outcome measures (e.g., thyroid diseases, insulin-dependent diabetes mellitus, impaired renal function, tumors, anemia) Intake of immunosuppressives or supplements (e.g., fish oil) Participation in another study