Plasma growth hormone concentrations during a 65-min infusion of acyl ghrelin at 0.3, 0.9, or 1.5 nmol/kg/h, or saline. Plasma growth hormone concentrations during a 65-min infusion of acyl ghrelin at 0.3, 0.9, or 1.5 nmol/kg/h, or saline. Glucose was administered as an intravenous bolus after 55 min of the infusion. a, b, and c are saline vs. 0.3, 0.9, or 1.5 nmol/kg/h of ghrelin, respectively; *P < 0.05, ***P < 0.001. Jenny Tong et al. Diabetes 2010;59:2145-2151 ©2010 by American Diabetes Association