Arne Astrup is the head of the Department of Nutrition, Exercise, and Sports at the Faculty of Science, University of Copenhagen, and has built up one of the world's leading obesity research teams. In 2015, he became part of Weight Watchers' Scientific Advisory Board. Professor Jennie Brand-Miller is recognized internationally for her research on the glycemic index, with more than 250 scientific publications. Her trade books under the series titles The New Glucose Revolution and The Low GI Diet have sold more than 3.5 million copies worldwide. Christian Bitz is the head of research at Herlev-Gentofte Hospital in Denmark, and the author of four best-selling books in Europe. He is a regular contributor on Danish TV and the host of his own weekly healthy-living television show.