Chennai: The Madras Diabetes Research Foundation (MDRF) has signed a memorandum of understanding (MoU) with Bengaluru's Centre for Brain Research (CBR) and the UK Dementia Research Institute (UK DRI) to study the two-way link between diabetes and dementia. "Blood sugar, high or low, can cause vascular dementia, where poor blood flow affects cognitive function. "For a large study, people above 60 years will be screened for diabetes and dementia at MDRF's Gopalapuram Centre for Healthy Ageing, he said. Patients are scored from 1 to 5, with one indicating poor cognitive function and five very good. "With smartphones and blood tests now widely available in urban areas, we intend to keep this minimally invasive and scalable."