Compared to the FD group, the small intestinal propulsion rate significantly increased (p < 0.01), the serum NO levels significantly decreased (p < 0.05), the GAS levels increased significantly (p < 0.01), the VIP levels in the duodenal homogenate decreased significantly (p < 0.01), and the SP and 5-HT levels significantly increased (p < 0.05) in the CF group (Figures 3D–J). Here, VIP is linked to cystic fibrosis.