Fig. 4.

Cumulative lymphatic GIP (A) and GLP-1 (B) output plotted as a function of nutrient dose. Five carbohydrate (●) and 5 whey protein (□) doses were tested (0.275, 0.55, 1.1, 2.2, 4.4 kcal for each nutrient). Values (fold amounts above saline) are means + SE. Equations for best-fit lines generated for GIP and GLP-1 are shown. Only the slopes for the carbohydrate best-fit lines were significantly greater than zero (P < 0.001, carbohydrate GIP; P < 0.001, carbohydrate GLP-1; P = 0.209, protein GIP; P = 0.228, protein GLP-1).