INCLUSION CRITERIA:
Age: 18-65 years
Diagnosis: Healthy
EXCLUSION CRITERIA:
Serious medical illness (including diabetes) as determined from H& P or laboratory testing
Prescription psychotropic medication; drug free period must be greater than 3 weeks for anticholinergics and benzodiazepine and greater than 8 weeks for fluoxetine, antipsychotics, anticonvulsants
Claustrophobia
Pregnancy; women with child bearing potential will have pregnancy test to exclude pregnancy
Any condition that increases risk for MRI (e.g., pacemaker, metallic foreign body in the eye, etc.)
Unable to lay on one's back for MRI/MRS scans
Positive HIV test