Research Focus
Vitamin D Metabolism
Our research primarily focuses on sources and metabolism of vitamin D, as well as factors closely related to vitamin D, such as phosphate or fibroblast growth factor 23 (FGF23). On the one hand, we are interested in identifying novel biomarkers for assessing vitamin D status; on the other hand, we aim to generate new insights into the absorption, tissue distribution, function, and role of vitamin D in disease prevention. Since 2018, we have devoted increased attention to the bioavailability and cellular effects of photoproducts generated during UV light exposure. These compounds were long assumed to be neither bioavailable nor physiologically active. However, more recent data indicate that they can be metabolized in the body and are capable of stimulating the vitamin D receptor, which functions as a transcription factor.
Plant Protein Sources for Human Nutrition
Another major research area is the physiological evaluation of novel plant protein sources for human consumption. In this context, we have primarily investigated protein from sweet lupin, but also rapeseed protein, which is currently used exclusively in animal nutrition. In addition, our research group is actively involved in the development of the new protein guideline of the German Nutrition Society.