The study will start at ca. 10h00-12h00 and the women will be fasting since ca. 4 hours. There will be no restriction of water-intake before and throughout the study. An intravenous cannula will be inserted in the antecubital vein of one arm for blood withdrawal. The subjects will rest for ca. 30 minutes. Then, a basal blood withdrawal will be performed, thereafter 4 times halfhourly.