Inclusion Criteria:  Age 60 and older Stable medication doses (>1month) Post-menopausal Diagnosis of either Nondemented (CDR 0) or Probable AD (CDR 0.5 or 1 only)  Exclusion Criteria:  Inability to provide consent Diagnosis of insulin-dependent (Type 1) Diabetes Mellitus Anti-platelet medication (Plavix), Warfarin, and other anticoagulants (Eliquis, Pradaxa, and Xarelto) Recent ischemic heart disease (<2 years) Diagnosis of a clinically significant chronic disease including CVD, other metabolic diseases (e.g., thyroid), cancer, HIV, or acquired immunodeficiency syndrome Any Neurological disorders that have the potential to impair cognition or brain metabolism (e.g., Parkinson's disease, stroke defined as a clinical episode with neuroimaging evidence in an appropriate area to explain the symptoms). Clinically significant depressive symptoms that may impair cognition, abnormalities in B12, RPR, or thyroid function that may impair cognition, use of psychoactive and investigational medications, and significant visual or auditory impairment