Institute of Nutritional Sciences, Friedrich Schiller University Jena, Dornburger Straße 24, 07743 Jena, Germany. ulrike.trautvetter@uni-jena.de. Institute of Nutritional Sciences, Friedrich Schiller University Jena, Dornburger Straße 24, 07743 Jena, Germany. Bianka.Ditscheid@med.uni-jena.de. Institute of General Practice and Family Medicine, Jena University Hospital, Bachstraße 18, 07743 Jena, Germany. Bianka.Ditscheid@med.uni-jena.de. Institute of Nutritional Sciences, Friedrich Schiller University Jena, Dornburger Straße 24, 07743 Jena, Germany. Gerhard.Jahreis@uni-jena.de. Institute of Nutritional Sciences, Friedrich Schiller University Jena, Dornburger Straße 24, 07743 Jena, Germany. Michael.Glei@uni-jena.de.