Department of Medicine, Helsinki University Hospital and University of Helsinki, Helsinki, Finland. Hannele.Yki-Jarvinen@helsinki.fi. Minerva Foundation Institute for Medical Research, Helsinki, Finland. Hannele.Yki-Jarvinen@helsinki.fi. Department of Medicine, Helsinki University Hospital and University of Helsinki, Helsinki, Finland. Minerva Foundation Institute for Medical Research, Helsinki, Finland. Department of Internal Medicine, Yale University, New Haven, CT, USA. Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, UK. National Institute for Health Research Oxford Biomedical Research Centre, Oxford University Hospitals Foundation Trust, Oxford, UK. School of Food Science & Nutrition, University of Leeds, Leeds, UK.