Lymph flow (A, B), GLP-1 concentrations (C, D), GLP-1 appearance (E, F) and DPP-4 activity (G, H) before and after gastric instillation of 75 mg glucose (0.3 kcal) with (●-●; n = 9) or without (○-○; n = 6) DPP-4 inhibition (NVP DPP728; 10 μmol/kg) (left panels) or after gastric instillation of 33 mg fat emulsion (0.3 kcal) with (●-●; n = 7) or without (○-○; n = 7) NVP DPP728 (10 μmol/kg) (right panels) in anesthetized C57BL/6J mice (mean ± SEM).