Old age, atherosclerosis, stroke, hypertension, transient ischemic attacks, cardiac disease, the epsilon 4 allele of the apolipoprotein E (ApoE), elevated homocysteine levels, hyperlipidemia, metabolic syndrome, obesity and diabetes are risk factors for both vascular dementia and AD [5-7,10-16]. The gene discussed is APOE; the disease is obesity due to melanocortin 4 receptor deficiency.