1. Which of the following is NOT a mechanism of action of GLP-1 receptor agonists on glucose homeostasis:
A. Stimulation of insulin secretion
B. Inhibition of glucagon secretion
C. Direct and indirect suppression of endogenous glucose production
D. Suppression of appetite
E. Enhanced insulin sensitivity secondary to weight loss
F. Delayed gastric emptying with less postprandial hyperglycemia
G. All of the above are mechanisms of action of GLP-1 receptor agonists.