Prof. Keijer is a molecular physiologist and a pioneer in Nutrigenomics. He investigates how nutrients target energy metabolism and mitochondrial functioning and how this is related to metabolic health. His research aims for fundamental insights, biomarkers and efficacy substantiation. His initial interest in beta-carotene has broadened to other carotenoids. His core expertise consists of dietary intervention studies in humans, rodents and cells, coupled to assessed by advanced physiological and in depth molecular and biochemical methods.