 INTRODUCTION Cognitive impairment, a principal cause for functional disability among the elderly, can lead to dementing illness over time mainly in the forms of Alzheimers Disease AD and vascular dementia VaD. In fact, AD prevalence is expected to rise, reaching 100 million worldwide by 2050, with 1 in 85 persons potentially living with AD.1 Thus, uncovering modifiable risk factors that would prevent or delay cognitive impairment is important. 