[1
]From the Oxford Project to Investigate Memory and Ageing (OPTIMA), Department of Physiology,
Anatomy & Genetics, University of Oxford, Oxford, United Kingdom (ADS and HR); the
Departments of Medicine and Nutritional Sciences, University of Toronto, Division
of Gastroenterology, St Michael's Hospital, Toronto, Canada (Y-IK); and the Institute
of Basic Medical Sciences, Department of Nutrition, Uni