Dose-Dependent Effect of Intranasal Insulin in Humans Using Functional Magnetic Resonance Imaging (fMRI)

"Enrolled Participants for this trial will come for 3 study visits. The doses will be administered in varying order: participants will be randomized to one six possible permutations of the intranasal study doses (0, 500, 1000 U) of intranasal insulin at each visit.~Participants will undergo a fMRI scan before and after receiving intranasal doses. Additionally, participants will have blood samples taken."