<qa>  What is the effect of a single dose of GLP-1 receptor agonist on cerebral bloodThis randomized controlled trial investigates the effect of a single dose of glucagon-like peptide-1 GLP-1 receptor agonist on cerebral blood flow velocity and cortical oxygination in humans without cerebrovascular disease. This study serves as a control for a similar study investigating the effect in stroke patients ref. to EGRABIS1. 