Blood was collected by qualified research assistants using a standardized protocol (Supplementary Data). Blood for chemistry and hematology measurements was analyzed by the UMCG. Plasma glucose concentration was measured on an YSI 2300 Stat glucose/lactate analyzer (YSI, Inc., Yellow Springs, OH). Serum insulin concentration was measured using radioimmunoassay (Diagnostic Laboratories, Los Angeles, CA) (Cree et al, 2008 (link)). Total GLP-1, GLP-2, and ghrelin were analyzed at DSM Nutritional Products, Switzerland, by using commercially available ELISA kits (Millipore Corp).
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