Fig. 5.

Hourly lymphatic GIP (A) and GLP-1 (B) output following either an ileal carbohydrate (carb; 0.275, 0.55, 1.1 kcal) or saline bolus. Hourly output was determined by multiplying together the lymph flow rate by the hourly GIP or GLP-1 concentration. Values are means + SE. *P < 0.05 vs. saline at time of peak secretion. Cumulative lymphatic GIP and GLP-1 output plotted a function of carbohydrate dose. Three ileal (C) and 3 duodenal (D) doses were tested (0.275, 0.55, 1.1 kcal). Values (fold amounts above saline) are means + SE. Equations for best-fit lines generated for GIP and GLP-1 are shown. All of the slopes for the best-fit lines were significantly greater than zero.