Natural daylight during office hours improves glucose control and whole-body substrate metabolism.

Address: Department of Nutrition and Movement Sciences, NUTRIM Institute of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, the Netherlands; Healthy Living Spaces Lab, Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Aachen, Germany; Chair of Healthy Living Spaces, Faculty of Architecture, RWTH Aachen University, Aachen, Germany.; Department of Nutrition and Movement Sciences, NUTRIM Institute of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, the Netherlands.; The Thoracic and Endocrine Surgery Division, Department of Surgery, Geneva University Hospitals, Geneva, Switzerland; Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, Geneva, Switzerland; iGE3 Center, Geneva, Switzerland; Diabetes Centre, Faculty of Medicine, University of Geneva, Geneva, Switzerland.; The Thoracic and Endocrine Surgery Division, Department of Surgery, Geneva University Hospitals, Geneva, Switzerland; Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, Geneva, Switzerland; iGE3 Center, Geneva, Switzerland; Diabetes Centre, Faculty of Medicine, University of Geneva, Geneva, Switzerland; Service of Endocrinology, Diabetology and Metabolism, Department of Medicine, Geneva University Hospitals (HUG), 1211 Geneva, Switzerland.; Molecular Discovery Platform, CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria.; Department of Nutrition and Movement Sciences, NUTRIM Institute of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, the Netherlands; Paracelsus Medical University, Research Program Medical Science, Nuremberg, Germany.; Department of Nutrition and Movement Sciences, NUTRIM Institute of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, the Netherlands; Department of Radiology & Nuclear Medicine, NUTRIM Institute of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, the Netherlands.; Department of Nutrition and Movement Sciences, NUTRIM Institute of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, the Netherlands; IRCCS Ospedale San Raffaele, Department of Immunology, Transplantation and Infectious Diseases (DITID), Milan, Italy.; Department of Nutrition and Movement Sciences, NUTRIM Institute of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, the Netherlands; Healthy Living Spaces Lab, Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Aachen, Germany.; Chronobiology Unit, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, the Netherlands; Chrono@Work, Groningen, the Netherlands.; Diabetes Centre, Faculty of Medicine, University of Geneva, Geneva, Switzerland; Service of Endocrinology, Diabetology and Metabolism, Department of Medicine, Geneva University Hospitals (HUG), 1211 Geneva, Switzerland.; Charité - Universitätsmedizin Berlin, Freie Universität Berlin, Humboldt Universität zu Berlin, Laboratory of Chronobiology, Berlin, Germany.; Institute for Clinical Diabetology, German Diabetes Center, Leibniz Institute for Diabetes Research at Heinrich Heine University Düsseldorf, Düsseldorf, Germany; German Center for Diabetes Research (DZD), Partner Düsseldorf, Neuherberg, Germany; Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands. Electronic address: [email protected].; The Thoracic and Endocrine Surgery Division, Department of Surgery, Geneva University Hospitals, Geneva, Switzerland; Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, Geneva, Switzerland; iGE3 Center, Geneva, Switzerland; Diabetes Centre, Faculty of Medicine, University of Geneva, Geneva, Switzerland. Electronic address: [email protected].; Department of Nutrition and Movement Sciences, NUTRIM Institute of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, the Netherlands. Electronic address: [email protected].