1 Interdisciplinary Research Center for Biosystems, Land Use and Nutrition (IFZ), Biometry and Population Genetics, Justus Liebig University, Heinrich-Buff-Ring 26, 35392, Giessen, Germany.
2 Department of Nutrition and Food Sciences, Human Nutrition, Rheinische Friedrich-Wilhelms-University Bonn, Meckenheimer Allee 166a, 53115, Bonn, Germany.
3 Department of Physiology and Biochemistry of Nutrition, Max Rubner-Institut, Federal Research Institute of Nutrition and Food, Haid-und-Neu-Str. 9, 76131, Karlsruhe, Germany.
4 Department of Science, German Nutrition Society, Godesberger Allee 136, 53175, Bonn, Germany. richter@dge.de.